Csharp/CSharp Tutorial/GUI Windows Forms/DataBinding TextBox

Data Binding: StringCollection

using System;
using System.Drawing;
using System.Collections;
using System.Collections.Specialized;
using System.ruponentModel;
using System.Windows.Forms;
public class DataBoundStringCollection : System.Windows.Forms.Form
{
  private Button RightButton= new Button();
  private Button LeftButton= new Button();
  private TextBox textBox2 = new TextBox();
  private TextBox textBox1 = new TextBox();
  private Button DoneButton= new Button();
  private StringCollection sa=new StringCollection();
    public DataBoundStringCollection()
    {
    this.textBox2.Location = new Point(184, 16);
    this.RightButton.Location = new Point(192, 64);
    this.RightButton.Text = ">>";
    this.RightButton.Click += new EventHandler(this.RightButton_Click);
    this.textBox1.Location = new Point(8, 16);
    this.DoneButton.Location = new Point(104, 64);
    this.DoneButton.Text = "Done";
    this.DoneButton.Click += new EventHandler(this.DoneButton_Click);
    this.LeftButton.Location = new Point(16, 64);
    this.LeftButton.Text = "<<";
    this.LeftButton.Click += new EventHandler(this.LeftButton_Click);
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(294, 111);
    this.ControlBox = false;
    this.Controls.AddRange(new Control[] {
                  this.RightButton,
                  this.LeftButton,
                  this.textBox2,
                  this.textBox1,
                  this.DoneButton});
    this.FormBorderStyle = FormBorderStyle.FixedDialog;
    this.ShowInTaskbar = false;
    this.ResumeLayout(false);
    sa.Add("A");
    sa.Add("B");
    sa.Add("C");
    sa.Add("D");
    this.textBox1.DataBindings.Add("Text",sa,"");
    this.textBox2.DataBindings.Add("Text",sa,"");
    }
    public override void Dispose()
    {
        base.Dispose();
    }

  protected void RightButton_Click (object sender, System.EventArgs e)
  {
    this.BindingContext[sa].Position++;
  }
  protected void LeftButton_Click (object sender, System.EventArgs e)
  {
    this.BindingContext[sa].Position--;
  }
  protected void DoneButton_Click (object sender, System.EventArgs e)
  {
    Application.Exit();
  }
  public static void Main()
  {
    Application.Run(new DataBoundStringCollection());
  }
}

Data Entry With Binding

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using System.Xml.Serialization;
class MyClass : Form
{
    XmlSerializer xmlser = new XmlSerializer(typeof(Employee));
    BindingSource bindsrc = new BindingSource();
    public static void Main()
    {
        Application.Run(new MyClass());
    }
    public MyClass()
    {
        bindsrc.Add(new Employee());
        EmployeePanel personpnl = new EmployeePanel(bindsrc);
        personpnl.Parent = this;
        personpnl.Dock = DockStyle.Fill;
        MenuStrip menu = new MenuStrip();
        menu.Parent = this;
        ToolStripMenuItem item = (ToolStripMenuItem) menu.Items.Add("&File");
        item.DropDownItems.Add("&New", null, FileNewOnClick);
        item.DropDownItems.Add("&Open...", null, FileOpenOnClick);
        item.DropDownItems.Add("Save &As...", null, FileSaveAsOnClick);
    }
    void FileNewOnClick(object objSrc, EventArgs args)
    {
        bindsrc[0] = new Employee();
    }
    void FileOpenOnClick(object objSrc, EventArgs args)
    {
        OpenFileDialog dlg = new OpenFileDialog();
        if (dlg.ShowDialog() == DialogResult.OK)
        {
            StreamReader sr = new StreamReader(dlg.FileName);
            bindsrc[0] = xmlser.Deserialize(sr);
            sr.Close();
        }
    }
    void FileSaveAsOnClick(object objSrc, EventArgs args)
    {
        SaveFileDialog dlg = new SaveFileDialog();
        if (dlg.ShowDialog() == DialogResult.OK)
        {
            StreamWriter sw = new StreamWriter(dlg.FileName);
            xmlser.Serialize(sw, bindsrc[0]);
            sw.Close();
        }
    }
}
class EmployeePanel : FlowLayoutPanel
{
    public EmployeePanel(BindingSource bindsrc)
    {
        Label lbl = new Label();
        lbl.Parent = this;
        lbl.Text = "First Name: ";
        lbl.AutoSize = true;
        lbl.Anchor = AnchorStyles.Left;
        TextBox txtboxFirstName = new TextBox();
        txtboxFirstName.Parent = this;
        txtboxFirstName.AutoSize = true;
        txtboxFirstName.DataBindings.Add("Text", bindsrc, "FirstName");
        txtboxFirstName.DataBindings[0].DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged;
        this.SetFlowBreak(txtboxFirstName, true);
        lbl = new Label();
        lbl.Parent = this;
        lbl.Text = "Last Name: ";
        lbl.AutoSize = true;
        lbl.Anchor = AnchorStyles.Left;
        TextBox txtboxLastName = new TextBox();
        txtboxLastName.Parent = this;
        txtboxLastName.AutoSize = true;
        txtboxLastName.DataBindings.Add("Text", bindsrc, "LastName");
        txtboxLastName.DataBindings[0].DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged;
        this.SetFlowBreak(txtboxLastName, true);
        lbl = new Label();
        lbl.Parent = this;
        lbl.Text = "Birth Date: ";
        lbl.AutoSize = true;
        lbl.Anchor = AnchorStyles.Left;
        DateTimePicker dtPicker = new DateTimePicker();
        dtPicker.Parent = this;
        dtPicker.AutoSize = true;
        dtPicker.DataBindings.Add("Value", bindsrc, "BirthDate");
        dtPicker.DataBindings[0].DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged;
    }
}
class Employee
{
    public string FirstName;
    public string LastName;
    public DateTime BirthDate;
}