Csharp/C Sharp/Database ADO.net/Data Binding

ADO.NET Binding: Handling Errors

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace ADO.NET_Binding
{
    /// <summary>
    /// Summary description for HandlingErrors.
    /// </summary>
    public class HandlingErrors : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.Label lblErrorSummary;
        internal System.Windows.Forms.Button cmdNext;
        internal System.Windows.Forms.Button cmdPrev;
        internal System.Windows.Forms.Label Label4;
        internal System.Windows.Forms.GroupBox GroupBox1;
        internal System.Windows.Forms.Label Label3;
        internal System.Windows.Forms.Label Label2;
        internal System.Windows.Forms.Label Label1;
        internal System.Windows.Forms.TextBox txtModelName;
        internal System.Windows.Forms.TextBox txtDescription;
        internal System.Windows.Forms.TextBox txtUnitCost;
        internal System.Windows.Forms.TextBox txtModelNumber;
        internal System.Windows.Forms.ruboBox cboModelName;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public HandlingErrors()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.lblErrorSummary = new System.Windows.Forms.Label();
            this.cmdNext = new System.Windows.Forms.Button();
            this.cmdPrev = new System.Windows.Forms.Button();
            this.Label4 = new System.Windows.Forms.Label();
            this.GroupBox1 = new System.Windows.Forms.GroupBox();
            this.Label3 = new System.Windows.Forms.Label();
            this.Label2 = new System.Windows.Forms.Label();
            this.Label1 = new System.Windows.Forms.Label();
            this.txtModelName = new System.Windows.Forms.TextBox();
            this.txtDescription = new System.Windows.Forms.TextBox();
            this.txtUnitCost = new System.Windows.Forms.TextBox();
            this.txtModelNumber = new System.Windows.Forms.TextBox();
            this.cboModelName = new System.Windows.Forms.ruboBox();
            this.GroupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // lblErrorSummary
            // 
            this.lblErrorSummary.ForeColor = System.Drawing.Color.Red;
            this.lblErrorSummary.Location = new System.Drawing.Point(26, 296);
            this.lblErrorSummary.Name = "lblErrorSummary";
            this.lblErrorSummary.Size = new System.Drawing.Size(328, 40);
            this.lblErrorSummary.TabIndex = 29;
            // 
            // cmdNext
            // 
            this.cmdNext.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
            this.cmdNext.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.cmdNext.Location = new System.Drawing.Point(322, 348);
            this.cmdNext.Name = "cmdNext";
            this.cmdNext.Size = new System.Drawing.Size(92, 28);
            this.cmdNext.TabIndex = 28;
            this.cmdNext.Text = "Next >>";
            this.cmdNext.Click += new System.EventHandler(this.cmdNext_Click);
            // 
            // cmdPrev
            // 
            this.cmdPrev.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left);
            this.cmdPrev.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.cmdPrev.Location = new System.Drawing.Point(18, 348);
            this.cmdPrev.Name = "cmdPrev";
            this.cmdPrev.Size = new System.Drawing.Size(92, 28);
            this.cmdPrev.TabIndex = 27;
            this.cmdPrev.Text = "<< Prev";
            this.cmdPrev.Click += new System.EventHandler(this.cmdPrev_Click);
            // 
            // Label4
            // 
            this.Label4.Location = new System.Drawing.Point(14, 16);
            this.Label4.Name = "Label4";
            this.Label4.Size = new System.Drawing.Size(88, 16);
            this.Label4.TabIndex = 26;
            this.Label4.Text = "Select a Record:";
            // 
            // GroupBox1
            // 
            this.GroupBox1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.GroupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                    this.Label3,
                                                                                    this.Label2,
                                                                                    this.Label1,
                                                                                    this.txtModelName,
                                                                                    this.txtDescription,
                                                                                    this.txtUnitCost,
                                                                                    this.txtModelNumber});
            this.GroupBox1.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.GroupBox1.Location = new System.Drawing.Point(14, 48);
            this.GroupBox1.Name = "GroupBox1";
            this.GroupBox1.Size = new System.Drawing.Size(400, 228);
            this.GroupBox1.TabIndex = 25;
            this.GroupBox1.TabStop = false;
            // 
            // Label3
            // 
            this.Label3.Location = new System.Drawing.Point(220, 56);
            this.Label3.Name = "Label3";
            this.Label3.Size = new System.Drawing.Size(36, 16);
            this.Label3.TabIndex = 18;
            this.Label3.Text = "Cost:";
            // 
            // Label2
            // 
            this.Label2.Location = new System.Drawing.Point(16, 56);
            this.Label2.Name = "Label2";
            this.Label2.Size = new System.Drawing.Size(52, 16);
            this.Label2.TabIndex = 17;
            this.Label2.Text = "Model:";
            // 
            // Label1
            // 
            this.Label1.Location = new System.Drawing.Point(16, 28);
            this.Label1.Name = "Label1";
            this.Label1.Size = new System.Drawing.Size(52, 16);
            this.Label1.TabIndex = 16;
            this.Label1.Text = "Name:";
            // 
            // txtModelName
            // 
            this.txtModelName.Location = new System.Drawing.Point(68, 24);
            this.txtModelName.Name = "txtModelName";
            this.txtModelName.Size = new System.Drawing.Size(316, 21);
            this.txtModelName.TabIndex = 15;
            this.txtModelName.Text = "";
            // 
            // txtDescription
            // 
            this.txtDescription.Location = new System.Drawing.Point(12, 92);
            this.txtDescription.Multiline = true;
            this.txtDescription.Name = "txtDescription";
            this.txtDescription.Size = new System.Drawing.Size(372, 116);
            this.txtDescription.TabIndex = 14;
            this.txtDescription.Text = "";
            // 
            // txtUnitCost
            // 
            this.txtUnitCost.Location = new System.Drawing.Point(256, 52);
            this.txtUnitCost.Name = "txtUnitCost";
            this.txtUnitCost.Size = new System.Drawing.Size(128, 21);
            this.txtUnitCost.TabIndex = 13;
            this.txtUnitCost.Text = "";
            // 
            // txtModelNumber
            // 
            this.txtModelNumber.Location = new System.Drawing.Point(68, 52);
            this.txtModelNumber.Name = "txtModelNumber";
            this.txtModelNumber.Size = new System.Drawing.Size(136, 21);
            this.txtModelNumber.TabIndex = 12;
            this.txtModelNumber.Text = "";
            // 
            // cboModelName
            // 
            this.cboModelName.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList;
            this.cboModelName.Location = new System.Drawing.Point(106, 10);
            this.cboModelName.Name = "cboModelName";
            this.cboModelName.Size = new System.Drawing.Size(308, 21);
            this.cboModelName.TabIndex = 24;
            // 
            // HandlingErrors
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(428, 386);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.lblErrorSummary,
                                                                          this.cmdNext,
                                                                          this.cmdPrev,
                                                                          this.Label4,
                                                                          this.GroupBox1,
                                                                          this.cboModelName});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "HandlingErrors";
            this.Text = "HandlingErrors";
            this.Load += new System.EventHandler(this.HandlingErrors_Load);
            this.GroupBox1.ResumeLayout(false);
            this.ResumeLayout(false);
        }
        #endregion

        [STAThread]
        static void Main() 
        {
            Application.Run(new HandlingErrors());
        }
        private BindingManagerBase storeBinding;
        private int currentPage;
        private bool errFlag;
        private void HandlingErrors_Load(object sender, System.EventArgs e)
        {
            DataSet dsStore = new DataSet();
            dsStore.ReadXmlSchema(Application.StartupPath + "\\store.xsd");
            dsStore.ReadXml(Application.StartupPath + "\\store.xml");
            
            cboModelName.DataSource = dsStore.Tables["Products"];
            cboModelName.DisplayMember = "ModelName";
            
            txtModelName.DataBindings.Add("Text", dsStore.Tables["Products"], "ModelName");
            txtModelNumber.DataBindings.Add("Text", dsStore.Tables["Products"], "ModelNumber");
            txtUnitCost.DataBindings.Add("Text", dsStore.Tables["Products"], "UnitCost");
            txtDescription.DataBindings.Add("Text", dsStore.Tables["Products"], "Description");
            
            storeBinding = this.BindingContext[dsStore.Tables["Products"]];
            storeBinding.PositionChanged += new EventHandler(Binding_PositionChanged);
            dsStore.Tables["Products"].ColumnChanged += new
                DataColumnChangeEventHandler(TableChanging);
        }

        private void Binding_PositionChanged(object sender, System.EventArgs e)
        {
            if (errFlag)
            {
                // Reset the page.
                storeBinding.Position = currentPage;
            }
            else
            {
                // Allow the page to change and update the currentPage variable.
                currentPage = storeBinding.Position;
            }
        }
        private void TableChanging(object sender, System.Data.DataColumnChangeEventArgs e)
        {
            string errors = DBStore.ValidateProduct(e.Row);
            if (errors == "")
            {
                errFlag = false;
            }
            else
            {
                errFlag = true;
            }
            lblErrorSummary.Text = errors;
        }
        private void cmdNext_Click(object sender, System.EventArgs e)
        {
            storeBinding.Position++;
        }
        private void cmdPrev_Click(object sender, System.EventArgs e)
        {
            storeBinding.Position--;
        }
    }

    public class DBStore
    {
        public static string ValidateProduct(DataRow row)
        {
            string errors = "";
            if (((decimal)row["UnitCost"]) <= 0)
            {
                errors += "* UnitCost value too low\n";
            }
            if (row["ModelNumber"].ToString() == "")
            {
                errors += "* You must specify a ModelNumber\n";
            }
            if (row["ModelName"].ToString() == "")
            {
                errors += "* You must specify a ModelName\n";
            }
            return errors;
        }
    }
}

<A href="http://www.nfex.ru/Code/CSharpDownload/ADO.NETBinding.zip">ADO.NETBinding.zip( 76 k)</a>

ADO.NET Binding: Master Detail

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Data;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
namespace ADO.NET_Binding
{
    /// <summary>
    /// Summary description for MasterDetail.
    /// </summary>
    public class MasterDetail : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.Label Label2;
        internal System.Windows.Forms.Label Label1;
        internal System.Windows.Forms.ListBox lstProduct;
        internal System.Windows.Forms.ListBox lstCategory;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public MasterDetail()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Label2 = new System.Windows.Forms.Label();
            this.Label1 = new System.Windows.Forms.Label();
            this.lstProduct = new System.Windows.Forms.ListBox();
            this.lstCategory = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // Label2
            // 
            this.Label2.Location = new System.Drawing.Point(212, 13);
            this.Label2.Name = "Label2";
            this.Label2.Size = new System.Drawing.Size(120, 16);
            this.Label2.TabIndex = 9;
            this.Label2.Text = "Products:";
            // 
            // Label1
            // 
            this.Label1.Location = new System.Drawing.Point(12, 13);
            this.Label1.Name = "Label1";
            this.Label1.Size = new System.Drawing.Size(120, 16);
            this.Label1.TabIndex = 8;
            this.Label1.Text = "Categories:";
            // 
            // lstProduct
            // 
            this.lstProduct.Location = new System.Drawing.Point(212, 29);
            this.lstProduct.Name = "lstProduct";
            this.lstProduct.Size = new System.Drawing.Size(208, 225);
            this.lstProduct.TabIndex = 7;
            // 
            // lstCategory
            // 
            this.lstCategory.Location = new System.Drawing.Point(12, 29);
            this.lstCategory.Name = "lstCategory";
            this.lstCategory.Size = new System.Drawing.Size(192, 225);
            this.lstCategory.TabIndex = 6;
            // 
            // MasterDetail
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(432, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.Label2,
                                                                          this.Label1,
                                                                          this.lstProduct,
                                                                          this.lstCategory});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "MasterDetail";
            this.Text = "MasterDetail";
            this.Load += new System.EventHandler(this.MasterDetail_Load);
            this.ResumeLayout(false);
        }
        #endregion

        private BindingManagerBase categoryBinding;
        private DataSet dsStore = new DataSet();

        private void MasterDetail_Load(object sender, System.EventArgs e)
        {
            dsStore.ReadXmlSchema(Application.StartupPath + "\\store.xsd");
            dsStore.ReadXml(Application.StartupPath + "\\store.xml");
        
            lstCategory.DataSource = dsStore.Tables["Categories"];
            lstCategory.DisplayMember = "CategoryName";
            lstProduct.DataSource = dsStore.Tables["Products"];
            lstProduct.DisplayMember = "ModelName";
            categoryBinding = this.BindingContext[dsStore.Tables["Categories"]];
            categoryBinding.PositionChanged += new EventHandler(Binding_PositionChanged);
            // Invoke method once to update child table at startup.
            Binding_PositionChanged(null,null);
        }
        private void Binding_PositionChanged(object sender, System.EventArgs e)
        {
            string filter;
            DataRow selectedRow;
            // Find the current category row.
            selectedRow = dsStore.Tables["Categories"].Rows[categoryBinding.Position];
            // Create a filter expression using its CategoryID.
            filter = "CategoryID="" + selectedRow["CategoryID"].ToString() + """;
            // Modify the view onto the product table.
            dsStore.Tables["Products"].DefaultView.RowFilter = filter;
        }
        [STAThread]
        static void Main() 
        {
            Application.Run(new MasterDetail());
        }
    }
}

<A href="http://www.nfex.ru/Code/CSharpDownload/ADO.NETBinding.zip">ADO.NETBinding.zip( 76 k)</a>

ADO.NET Binding : Multiple Control Binding

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace ADO.NET_Binding
{
    /// <summary>
    /// Summary description for MultipleControlBinding.
    /// </summary>
    public class MultipleControlBinding : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.GroupBox GroupBox1;
        internal System.Windows.Forms.Label lblDescription;
        internal System.Windows.Forms.Label lblUnitCost;
        internal System.Windows.Forms.Label lblModelNumber;
        internal System.Windows.Forms.Button cmdNext;
        internal System.Windows.Forms.Button cmdPrev;
        internal System.Windows.Forms.ruboBox cboModelName;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public MultipleControlBinding()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.GroupBox1 = new System.Windows.Forms.GroupBox();
            this.lblDescription = new System.Windows.Forms.Label();
            this.lblUnitCost = new System.Windows.Forms.Label();
            this.lblModelNumber = new System.Windows.Forms.Label();
            this.cmdNext = new System.Windows.Forms.Button();
            this.cmdPrev = new System.Windows.Forms.Button();
            this.cboModelName = new System.Windows.Forms.ruboBox();
            this.GroupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // GroupBox1
            // 
            this.GroupBox1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.GroupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                    this.lblDescription,
                                                                                    this.lblUnitCost,
                                                                                    this.lblModelNumber});
            this.GroupBox1.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.GroupBox1.Location = new System.Drawing.Point(18, 47);
            this.GroupBox1.Name = "GroupBox1";
            this.GroupBox1.Size = new System.Drawing.Size(312, 168);
            this.GroupBox1.TabIndex = 10;
            this.GroupBox1.TabStop = false;
            // 
            // lblDescription
            // 
            this.lblDescription.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.lblDescription.Location = new System.Drawing.Point(8, 58);
            this.lblDescription.Name = "lblDescription";
            this.lblDescription.Size = new System.Drawing.Size(296, 98);
            this.lblDescription.TabIndex = 6;
            // 
            // lblUnitCost
            // 
            this.lblUnitCost.Location = new System.Drawing.Point(168, 16);
            this.lblUnitCost.Name = "lblUnitCost";
            this.lblUnitCost.Size = new System.Drawing.Size(136, 32);
            this.lblUnitCost.TabIndex = 5;
            // 
            // lblModelNumber
            // 
            this.lblModelNumber.Location = new System.Drawing.Point(8, 16);
            this.lblModelNumber.Name = "lblModelNumber";
            this.lblModelNumber.Size = new System.Drawing.Size(140, 32);
            this.lblModelNumber.TabIndex = 4;
            // 
            // cmdNext
            // 
            this.cmdNext.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
            this.cmdNext.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.cmdNext.Location = new System.Drawing.Point(238, 227);
            this.cmdNext.Name = "cmdNext";
            this.cmdNext.Size = new System.Drawing.Size(92, 28);
            this.cmdNext.TabIndex = 9;
            this.cmdNext.Text = "Next >>";
            this.cmdNext.Click += new System.EventHandler(this.cmdNext_Click);
            // 
            // cmdPrev
            // 
            this.cmdPrev.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left);
            this.cmdPrev.Enabled = false;
            this.cmdPrev.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.cmdPrev.Location = new System.Drawing.Point(18, 227);
            this.cmdPrev.Name = "cmdPrev";
            this.cmdPrev.Size = new System.Drawing.Size(92, 28);
            this.cmdPrev.TabIndex = 8;
            this.cmdPrev.Text = "<< Prev";
            this.cmdPrev.Click += new System.EventHandler(this.cmdPrev_Click);
            // 
            // cboModelName
            // 
            this.cboModelName.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList;
            this.cboModelName.Location = new System.Drawing.Point(14, 11);
            this.cboModelName.Name = "cboModelName";
            this.cboModelName.Size = new System.Drawing.Size(316, 21);
            this.cboModelName.TabIndex = 7;
            // 
            // MultipleControlBinding
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(344, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.GroupBox1,
                                                                          this.cmdNext,
                                                                          this.cmdPrev,
                                                                          this.cboModelName});
            this.Name = "MultipleControlBinding";
            this.Text = "Manual Navigation Control";
            this.Load += new System.EventHandler(this.MultipleControlBinding_Load);
            this.GroupBox1.ResumeLayout(false);
            this.ResumeLayout(false);
        }
        #endregion

        private BindingManagerBase storeBinding;
        private void MultipleControlBinding_Load(object sender, System.EventArgs e)
        {
            DataSet dsStore = new DataSet();
            dsStore.ReadXmlSchema(Application.StartupPath + "\\store.xsd");
            dsStore.ReadXml(Application.StartupPath + "\\store.xml");
            cboModelName.DataSource = dsStore.Tables["Products"];
            cboModelName.DisplayMember = "ModelName";
            lblModelNumber.DataBindings.Add("Text", 
                dsStore.Tables["Products"], "ModelNumber");
            lblUnitCost.DataBindings.Add("Text", 
                dsStore.Tables["Products"], "UnitCost");
            lblDescription.DataBindings.Add("Text", 
                dsStore.Tables["Products"], "Description");
            storeBinding = this.BindingContext[dsStore.Tables["Products"]];
            storeBinding.PositionChanged += new EventHandler(Binding_PositionChanged);
        }
        [STAThread]
        static void Main() 
        {
            Application.Run(new MultipleControlBinding());
        }
        private void cmdNext_Click(object sender, System.EventArgs e)
        {
                storeBinding.Position++;
        }
        private void cmdPrev_Click(object sender, System.EventArgs e)
        {
                storeBinding.Position--;
        }
        private void Binding_PositionChanged(object sender, System.EventArgs e)
        {
            if (storeBinding.Position == storeBinding.Count - 1)
            {
                cmdNext.Enabled = false;
            }
            else
            {
                cmdNext.Enabled = true;
            }
            if (storeBinding.Position == 0)
            {
                cmdPrev.Enabled = false;
            }
            else
            {
                cmdPrev.Enabled = true;
            }
        }
    }
}

<A href="http://www.nfex.ru/Code/CSharpDownload/ADO.NETBinding.zip">ADO.NETBinding.zip( 76 k)</a>

ADO.NET Binding : Unsynchronized

/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace ADO.NET_Binding
{
    /// <summary>
    /// Summary description for Unsynchronized.
    /// </summary>
    public class Unsynchronized : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.GroupBox grp;
        internal System.Windows.Forms.ListBox lstProduct;
        internal System.Windows.Forms.GroupBox grpCategory;
        internal System.Windows.Forms.ListBox lstCategory;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public Unsynchronized()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.grp = new System.Windows.Forms.GroupBox();
            this.lstProduct = new System.Windows.Forms.ListBox();
            this.grpCategory = new System.Windows.Forms.GroupBox();
            this.lstCategory = new System.Windows.Forms.ListBox();
            this.grp.SuspendLayout();
            this.grpCategory.SuspendLayout();
            this.SuspendLayout();
            // 
            // grp
            // 
            this.grp.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                              this.lstProduct});
            this.grp.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.grp.Location = new System.Drawing.Point(6, 137);
            this.grp.Name = "grp";
            this.grp.Size = new System.Drawing.Size(280, 136);
            this.grp.TabIndex = 5;
            this.grp.TabStop = false;
            // 
            // lstProduct
            // 
            this.lstProduct.Location = new System.Drawing.Point(16, 24);
            this.lstProduct.Name = "lstProduct";
            this.lstProduct.Size = new System.Drawing.Size(248, 95);
            this.lstProduct.TabIndex = 1;
            // 
            // grpCategory
            // 
            this.grpCategory.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                      this.lstCategory});
            this.grpCategory.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.grpCategory.Location = new System.Drawing.Point(6, 0);
            this.grpCategory.Name = "grpCategory";
            this.grpCategory.Size = new System.Drawing.Size(280, 136);
            this.grpCategory.TabIndex = 4;
            this.grpCategory.TabStop = false;
            // 
            // lstCategory
            // 
            this.lstCategory.Location = new System.Drawing.Point(16, 24);
            this.lstCategory.Name = "lstCategory";
            this.lstCategory.Size = new System.Drawing.Size(248, 95);
            this.lstCategory.TabIndex = 0;
            // 
            // Unsynchronized
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(300, 290);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.grp,
                                                                          this.grpCategory});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "Unsynchronized";
            this.Text = "Unsynchronized";
            this.Load += new System.EventHandler(this.Unsynchronized_Load);
            this.grp.ResumeLayout(false);
            this.grpCategory.ResumeLayout(false);
            this.ResumeLayout(false);
        }
        #endregion
        private void Unsynchronized_Load(object sender, System.EventArgs e)
        {
            // Make sure all the controls in this group box have a different binding.
            grpCategory.BindingContext = new BindingContext();
            DataSet dsStore = new DataSet();
            dsStore.ReadXmlSchema(Application.StartupPath + "\\store.xsd");
            dsStore.ReadXml(Application.StartupPath + "\\store.xml");
    
            lstCategory.DataSource = dsStore.Tables["Categories"];
            lstCategory.DisplayMember = "CategoryName";
            
            lstProduct.DataSource = dsStore.Tables["Categories"];
            lstProduct.DisplayMember = "CategoryName";
        }
        [STAThread]
        static void Main() 
        {
            Application.Run(new Unsynchronized());
        }
    }
}

<A href="http://www.nfex.ru/Code/CSharpDownload/ADO.NETBinding.zip">ADO.NETBinding.zip( 76 k)</a>

Data Binding 3

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
namespace DataBinding_3
{
    /// <summary>
    /// Summary description for DataBinding_3.
    /// </summary>
    public class DataBinding_3 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.DataGrid grdOrders;
        private System.Windows.Forms.DataGrid grdOrderDetails;
        private System.Windows.Forms.DataGrid grdCustomers;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public DataBinding_3()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            SqlConnection cn=new SqlConnection(@"data source=(local);uid=sa;password=;database=northwind");
      
            DataSet ds = new DataSet("CustOrders");
            SqlDataAdapter daCust=new SqlDataAdapter("select * from customers;select * from orders;select * from [order details]",cn);
            daCust.Fill(ds);
      
            ds.Relations.Add("CustOrder",ds.Tables["Table"].Columns["customerid"],ds.Tables["Table1"].Columns["customerid"]);
            ds.Relations.Add("OrderDetail",ds.Tables["Table1"].Columns["orderid"],ds.Tables["Table2"].Columns["orderid"]);
            grdCustomers.DataSource=ds;
            grdCustomers.DataMember="Table";
            grdOrders.DataSource=ds;
            grdOrders.DataMember="Table.CustOrder";
            grdOrderDetails.DataSource=ds;
            grdOrderDetails.DataMember="Table.CustOrder.OrderDetail";
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.grdCustomers = new System.Windows.Forms.DataGrid();
            this.grdOrders = new System.Windows.Forms.DataGrid();
            this.grdOrderDetails = new System.Windows.Forms.DataGrid();
            ((System.ruponentModel.ISupportInitialize)(this.grdCustomers)).BeginInit();
            ((System.ruponentModel.ISupportInitialize)(this.grdOrders)).BeginInit();
            ((System.ruponentModel.ISupportInitialize)(this.grdOrderDetails)).BeginInit();
            this.SuspendLayout();
            // 
            // grdCustomers
            // 
            this.grdCustomers.AllowNavigation = false;
            this.grdCustomers.DataMember = "";
            this.grdCustomers.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.grdCustomers.Location = new System.Drawing.Point(40, 16);
            this.grdCustomers.Name = "grdCustomers";
            this.grdCustomers.Size = new System.Drawing.Size(448, 152);
            this.grdCustomers.TabIndex = 0;
            // 
            // grdOrders
            // 
            this.grdOrders.AllowNavigation = false;
            this.grdOrders.DataMember = "";
            this.grdOrders.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.grdOrders.Location = new System.Drawing.Point(40, 176);
            this.grdOrders.Name = "grdOrders";
            this.grdOrders.Size = new System.Drawing.Size(448, 144);
            this.grdOrders.TabIndex = 1;
            // 
            // grdOrderDetails
            // 
            this.grdOrderDetails.DataMember = "";
            this.grdOrderDetails.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.grdOrderDetails.Location = new System.Drawing.Point(40, 328);
            this.grdOrderDetails.Name = "grdOrderDetails";
            this.grdOrderDetails.Size = new System.Drawing.Size(448, 136);
            this.grdOrderDetails.TabIndex = 2;
            // 
            // DataBinding_3
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(528, 483);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                  this.grdOrderDetails,
                                                                  this.grdOrders,
                                                                  this.grdCustomers});
            this.Name = "DataBinding_3";
            this.Text = "DataBinding_3";
            ((System.ruponentModel.ISupportInitialize)(this.grdCustomers)).EndInit();
            ((System.ruponentModel.ISupportInitialize)(this.grdOrders)).EndInit();
            ((System.ruponentModel.ISupportInitialize)(this.grdOrderDetails)).EndInit();
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new DataBinding_3());
        }
    }
}

Data Binding 4

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
namespace DataBinding
{
    /// <summary>
    /// Summary description for DataBinding4.
    /// </summary>
    public class DataBinding4 : System.Windows.Forms.Form
    {
    private System.Windows.Forms.DataGrid grdOrders;
    private System.Windows.Forms.DataGrid grdOrderDetails;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Label label2;
    private System.Windows.Forms.Label label3;
    private System.Windows.Forms.ruboBox cbCust;
    private System.Windows.Forms.TextBox txtPhoneNo;
    private System.Windows.Forms.TextBox txtFaxNo;
    private System.Windows.Forms.Label label4;
    private System.Windows.Forms.TextBox txtContact;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public DataBinding4()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
      SqlConnection cn=new SqlConnection(@"data source=(local);uid=sa;password=;database=northwind");
      
      DataSet ds = new DataSet("CustOrders");
      SqlDataAdapter daCust=new SqlDataAdapter("select * from customers;select * from orders;select * from [order details]",cn);
      daCust.Fill(ds);
      
      ds.Relations.Add("CustOrder",ds.Tables["Table"].Columns["customerid"],ds.Tables["Table1"].Columns["customerid"]);
      ds.Relations.Add("OrderDetail",ds.Tables["Table1"].Columns["orderid"],ds.Tables["Table2"].Columns["orderid"]);
      grdOrders.DataSource=ds;
      grdOrders.DataMember="Table.CustOrder";
      grdOrderDetails.DataSource=ds;
      grdOrderDetails.DataMember="Table.CustOrder.OrderDetail";
      cbCust.DataSource=ds;
      cbCust.DisplayMember="Table.rupanyName";
      txtContact.DataBindings.Add("Text",ds,"Table.ContactName");
      txtPhoneNo.DataBindings.Add("Text",ds,"Table.Phone");
      txtFaxNo.DataBindings.Add("Text",ds,"Table.Fax");
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
      this.grdOrders = new System.Windows.Forms.DataGrid();
      this.grdOrderDetails = new System.Windows.Forms.DataGrid();
      this.cbCust = new System.Windows.Forms.ruboBox();
      this.txtPhoneNo = new System.Windows.Forms.TextBox();
      this.txtFaxNo = new System.Windows.Forms.TextBox();
      this.label1 = new System.Windows.Forms.Label();
      this.label2 = new System.Windows.Forms.Label();
      this.label3 = new System.Windows.Forms.Label();
      this.label4 = new System.Windows.Forms.Label();
      this.txtContact = new System.Windows.Forms.TextBox();
      ((System.ruponentModel.ISupportInitialize)(this.grdOrders)).BeginInit();
      ((System.ruponentModel.ISupportInitialize)(this.grdOrderDetails)).BeginInit();
      this.SuspendLayout();
      // 
      // grdOrders
      // 
      this.grdOrders.AllowNavigation = false;
      this.grdOrders.DataMember = "";
      this.grdOrders.HeaderForeColor = System.Drawing.SystemColors.ControlText;
      this.grdOrders.Location = new System.Drawing.Point(40, 176);
      this.grdOrders.Name = "grdOrders";
      this.grdOrders.Size = new System.Drawing.Size(448, 144);
      this.grdOrders.TabIndex = 1;
      // 
      // grdOrderDetails
      // 
      this.grdOrderDetails.DataMember = "";
      this.grdOrderDetails.HeaderForeColor = System.Drawing.SystemColors.ControlText;
      this.grdOrderDetails.Location = new System.Drawing.Point(40, 328);
      this.grdOrderDetails.Name = "grdOrderDetails";
      this.grdOrderDetails.Size = new System.Drawing.Size(448, 136);
      this.grdOrderDetails.TabIndex = 2;
      // 
      // cbCust
      // 
      this.cbCust.DropDownStyle = System.Windows.Forms.ruboBoxStyle.DropDownList;
      this.cbCust.Location = new System.Drawing.Point(216, 32);
      this.cbCust.Name = "cbCust";
      this.cbCust.Size = new System.Drawing.Size(240, 21);
      this.cbCust.TabIndex = 3;
      // 
      // txtPhoneNo
      // 
      this.txtPhoneNo.Location = new System.Drawing.Point(216, 96);
      this.txtPhoneNo.Name = "txtPhoneNo";
      this.txtPhoneNo.Size = new System.Drawing.Size(240, 20);
      this.txtPhoneNo.TabIndex = 4;
      this.txtPhoneNo.Text = "textBox1";
      // 
      // txtFaxNo
      // 
      this.txtFaxNo.Location = new System.Drawing.Point(216, 128);
      this.txtFaxNo.Name = "txtFaxNo";
      this.txtFaxNo.Size = new System.Drawing.Size(240, 20);
      this.txtFaxNo.TabIndex = 5;
      this.txtFaxNo.Text = "textBox2";
      // 
      // label1
      // 
      this.label1.Location = new System.Drawing.Point(80, 32);
      this.label1.Name = "label1";
      this.label1.Size = new System.Drawing.Size(128, 24);
      this.label1.TabIndex = 6;
      this.label1.Text = "Customer Name";
      this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // label2
      // 
      this.label2.Location = new System.Drawing.Point(80, 96);
      this.label2.Name = "label2";
      this.label2.Size = new System.Drawing.Size(128, 24);
      this.label2.TabIndex = 7;
      this.label2.Text = "Phone Number";
      this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // label3
      // 
      this.label3.Location = new System.Drawing.Point(80, 128);
      this.label3.Name = "label3";
      this.label3.Size = new System.Drawing.Size(128, 24);
      this.label3.TabIndex = 8;
      this.label3.Text = "Fax Number";
      this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // label4
      // 
      this.label4.Location = new System.Drawing.Point(80, 64);
      this.label4.Name = "label4";
      this.label4.Size = new System.Drawing.Size(128, 24);
      this.label4.TabIndex = 10;
      this.label4.Text = "Contact Name";
      this.label4.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // txtContact
      // 
      this.txtContact.Location = new System.Drawing.Point(216, 64);
      this.txtContact.Name = "txtContact";
      this.txtContact.Size = new System.Drawing.Size(240, 20);
      this.txtContact.TabIndex = 9;
      this.txtContact.Text = "textBox1";
      // 
      // DataBinding4
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(520, 483);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                  this.label4,
                                                                  this.txtContact,
                                                                  this.label3,
                                                                  this.label2,
                                                                  this.label1,
                                                                  this.txtFaxNo,
                                                                  this.txtPhoneNo,
                                                                  this.cbCust,
                                                                  this.grdOrderDetails,
                                                                  this.grdOrders});
      this.Name = "DataBinding4";
      this.Text = "DataBinding4";
      ((System.ruponentModel.ISupportInitialize)(this.grdOrders)).EndInit();
      ((System.ruponentModel.ISupportInitialize)(this.grdOrderDetails)).EndInit();
      this.ResumeLayout(false);
    }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new DataBinding4());
        }
    }
}