Csharp/CSharp Tutorial/GUI Windows Forms/Dialog

About DialogBox

using System;
using System.Drawing;
using System.Windows.Forms;
   
class AboutDialogBox: Form
{
     public static void Main()
     {
          AboutDialogBox dlg = new AboutDialogBox();
          dlg.ShowDialog();
     }    
     public AboutDialogBox()
     {
          Text = "About AboutBox";
   
          StartPosition   = FormStartPosition.CenterParent;
          FormBorderStyle = FormBorderStyle.FixedDialog;
          ControlBox      = false;
          MaximizeBox     = false;
          MinimizeBox     = false;
          ShowInTaskbar   = false;
   
          Label label1     = new Label();
          label1.Parent    = this;
          label1.Text      = " AboutBox Version 1.0 ";
          label1.Font      = new Font(FontFamily.GenericSerif, 24, 
                                      FontStyle.Italic);
          label1.AutoSize  = true;
          label1.TextAlign = ContentAlignment.MiddleCenter;
   
          Icon icon = new Icon(GetType(), "AboutBox.ico");
   
          PictureBox picbox = new PictureBox();
          picbox.Parent     = this;
          picbox.Image      = icon.ToBitmap();
          picbox.SizeMode   = PictureBoxSizeMode.AutoSize;
          picbox.Location   = new Point(label1.Font.Height / 2, 
                                        label1.Font.Height / 2);
   
          label1.Location  = new Point(picbox.Right,label1.Font.Height / 2);
   
          int iClientWidth = label1.Right;
   
          Label label2     = new Label();
          label2.Parent    = this;
          label2.Text      = "\x00A9 ";
          label2.Font      = new Font(FontFamily.GenericSerif, 16);
          label2.Location  = new Point(0, label1.Bottom + 
                                          label2.Font.Height);
          label2.Size      = new Size(iClientWidth, label2.Font.Height);
          label2.TextAlign = ContentAlignment.MiddleCenter;
   
          Button button   = new Button();
          button.Parent   = this;
          button.Text     = "OK";
          button.Size     = new Size(4 * button.Font.Height, 
                                     2 * button.Font.Height);
          button.Location = new Point((iClientWidth - button.Size.Width) / 2,
                                   label2.Bottom + 2 * button.Font.Height);
   
          button.DialogResult = DialogResult.OK;
   
          CancelButton = button;
          AcceptButton = button;
   
          ClientSize = new Size(iClientWidth, 
                                button.Bottom + 2 * button.Font.Height);
     }
}

Call ShowDialog on Form object

using System;
using System.Drawing;
using System.Windows.Forms;
   
class SimplerDialog: Form
{
     public static void Main()
     {
          Application.Run(new SimplerDialog());
     }
     public SimplerDialog()
     {
          Text = "Simpler Dialog";
   
          Menu = new MainMenu();
          Menu.MenuItems.Add("&Dialog!", new EventHandler(MenuOnClick));
     }
     void MenuOnClick(object obj, EventArgs ea)
     {
          SimplerDialogBox dlg = new SimplerDialogBox();
          DialogResult     dr  = dlg.ShowDialog();
   
          Console.WriteLine(dr);
     }
}
class SimplerDialogBox: Form
{
     public SimplerDialogBox()
     {
          Text = "Simpler Dialog Box";
   
          FormBorderStyle = FormBorderStyle.FixedDialog;
          ControlBox      = false;
          MaximizeBox     = false;
          MinimizeBox     = false;
          ShowInTaskbar   = false;
   
          Button btn = new Button();
          btn.Parent   = this;
          btn.Text     = "OK";
          btn.Location = new Point(50, 50);
          btn.Size     = new Size (10 * Font.Height, 2 * Font.Height);
          btn.DialogResult = DialogResult.OK;
   
          btn = new Button();
          btn.Parent   = this;
          btn.Text     = "Cancel";
          btn.Location = new Point(50, 100);
          btn.Size     = new Size (10 * Font.Height, 2 * Font.Height);
          btn.DialogResult = DialogResult.Cancel;
     }
}

Create a custom dialog with radio button group

using System;
using System.ruponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Text;
class MyDialog : System.Windows.Forms.Form
{
  private Button okButton;
  private Button cancelButton;
  private CheckBox checkbox;
  private GroupBox radiogroup;
  private RadioButton radio1,radio2,radio3;
  public int Radio;
  public bool Check {
    get { return checkbox.Checked; }
    set { checkbox.Checked = value;}
    }
  void OnRadio(Object sender,EventArgs e)
  {
    int n=0;
    foreach(Object o in radiogroup.Controls)
    {
      if(o is RadioButton)
      {
        RadioButton r=(RadioButton)o;
        if(r.Checked)
          Radio=n;
        n++;
      }
    }
  }
  public MyDialog()
  {
    Size = new Size(400,300);
    FormBorderStyle = FormBorderStyle.FixedDialog;
    Text = "Dialog test";
    okButton = new Button();    
    okButton.DialogResult = DialogResult.OK;
    okButton.Location = new Point(20,230);
    okButton.Size = new Size(80,25);
    okButton.Text = "OK";
    Controls.Add(okButton);
    cancelButton = new Button();
    cancelButton.Location = new Point(300,230);
    cancelButton.Size = new Size(80,25);
    cancelButton.Text = "Cancel";
    cancelButton.DialogResult = DialogResult.Cancel;
    Controls.Add(cancelButton);
    checkbox = new CheckBox();
    checkbox.Location = new Point(20,30);
    checkbox.Size = new Size(300,25);
    checkbox.Text = "CheckBox";
    Controls.Add(checkbox);
    radiogroup = new GroupBox();
    radiogroup.Text = "Radio Buttons";
    radiogroup.Location = new Point(10,60);
    radiogroup.Size = new Size(380,110);
    Controls.Add(radiogroup);
    radio1 = new RadioButton();
    radio1.Location = new Point(10,15); 
    radio1.Size = new Size(360,25);
    radio1.Click += new EventHandler(OnRadio);
    radio1.Text = "Radio Button #1";
    radiogroup.Controls.Add(radio1);

    radio2 = new RadioButton();
    radio2.Location = new Point(10,40); 
    radio2.Size = new Size(360,25);
    radio2.Click += new EventHandler(OnRadio);
    radio2.Text = "Radio Button #2";
    radiogroup.Controls.Add(radio2);

    radio3 = new RadioButton();
    radio3.Location = new Point(10,70); 
    radio3.Size = new Size(360,25);
    radio3.Click += new EventHandler(OnRadio);
    radio3.Text = "Radio Button #3";
    radiogroup.Controls.Add(radio3);
  }
}
public class CustomDialogTest{
  public static void Main()
  {
    MyDialog dlg = new MyDialog();
    DialogResult r=dlg.ShowDialog();
    
      Console.WriteLine(dlg.Radio);
      Console.WriteLine(dlg.Check);
    
  }
}

Define Apply Button action method in dialog class

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class DialogApplyMethodInDialogClass : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnCreate;
  private System.Windows.Forms.Label lblReturn;
  public DialogApplyMethodInDialogClass()
  {
    InitializeComponent();
  }
  private void InitializeComponent()
  {
    this.btnCreate = new System.Windows.Forms.Button();
    this.lblReturn = new System.Windows.Forms.Label();
    this.SuspendLayout();
    this.btnCreate.Location = new System.Drawing.Point(80, 144);
    this.btnCreate.Name = "btnCreate";
    this.btnCreate.Size = new System.Drawing.Size(136, 23);
    this.btnCreate.TabIndex = 0;
    this.btnCreate.Text = "Create Dialog Box";
    this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
    this.lblReturn.Location = new System.Drawing.Point(88, 64);
    this.lblReturn.Name = "lblReturn";
    this.lblReturn.Size = new System.Drawing.Size(152, 23);
    this.lblReturn.TabIndex = 1;
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.lblReturn,
                                             this.btnCreate});
    this.ResumeLayout(false);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DialogApplyMethodInDialogClass());
  }
  private void btnCreate_Click(object sender, System.EventArgs e)
  {
    DialogDemo dlg = new DialogDemo(this);
    dlg.EnableApplyButton = false;
    dlg.ShowDialog();
    
    if (dlg.DialogResult == DialogResult.OK)
      {lblReturn.Text = dlg.TextOut;}
    else
      {lblReturn.Text = dlg.DialogResult.ToString();}
  }
  
  public void UpdateLabel(string str)
  {
    lblReturn.Text = str;
  }
}
public class DialogDemo : Form
{
  private Button btnApply = new Button();
  private TextBox txt = new TextBox();
  private DialogApplyMethodInDialogClass f;
  
  public DialogDemo(DialogApplyMethodInDialogClass f)
  {
    this.f = f;
    FormBorderStyle = FormBorderStyle.FixedDialog;
    BackColor = System.Drawing.Color.Aquamarine;
    ControlBox = false;
    MaximizeBox = false;
    MinimizeBox = false;
    ShowInTaskbar = false;
    Size = new Size(400,200);
    StartPosition = FormStartPosition.CenterScreen;
    Button btnOK = new Button();
    btnOK.Text = "OK";
    btnOK.DialogResult = DialogResult.OK;
    btnOK.Location = new Point(50,50);
    btnOK.TabIndex = 0;
    Controls.Add(btnOK);
    
    btnApply.Text = "Apply";
    btnApply.Location = new Point(150,50);
    btnApply.TabIndex = 1;
    btnApply.Enabled = false;
    btnApply.Click += new EventHandler(ApplyOnClick);
    Controls.Add(btnApply);
    
    Button btnCancel = new Button();
    btnCancel.Text = "Cancel";
    btnCancel.DialogResult = DialogResult.Cancel;
    btnCancel.Location = new Point(250,50);
    btnCancel.TabIndex = 2;
    Controls.Add(btnCancel);
    
    txt.Size = new Size(100,15);
    txt.Location = new Point(150,15);
    txt.TextChanged += new EventHandler(TextBoxChanged);
    Controls.Add(txt);
  }
  private void ApplyOnClick(object sender, EventArgs e)
  {
    f.UpdateLabel(txt.Text);
    EnableApplyButton = false;
  }
  
  private void TextBoxChanged(object sender, EventArgs e)
  {
    TextBox txt = (TextBox)sender;
    DialogDemo dlg = (DialogDemo)txt.Parent;
    dlg.EnableApplyButton = true;  
  }
  public bool EnableApplyButton
  {
    get {return btnApply.Enabled; }
    set {btnApply.Enabled = value; }
  }
  
  public string TextOut
  {
    get
      {return txt.Text; }
  }
}

Define your own dialog box

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormInvokeDialog : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  private System.Windows.Forms.MenuItem mnuModalBox;
  private System.Windows.Forms.MenuItem menuItem1;
  private System.Windows.Forms.MainMenu mainMenu1;
  
  private string dlgMsg = "Pick a menu item";
  public FormInvokeDialog()
  {
    InitializeComponent();
    CenterToScreen();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.menuItem1 = new System.Windows.Forms.MenuItem();
    this.mnuModalBox = new System.Windows.Forms.MenuItem();
    this.mainMenu1 = new System.Windows.Forms.MainMenu();
    // 
    // menuItem1
    // 
    this.menuItem1.Index = 0;
    this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                          this.mnuModalBox});
    this.menuItem1.Text = "Dialogs";
    // 
    // mnuModalBox
    // 
    this.mnuModalBox.Index = 0;
    this.mnuModalBox.Text = "Show Modal Box";
    this.mnuModalBox.Click += new System.EventHandler(this.mnuModalBox_Click);
    // 
    // mainMenu1
    // 
    this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                          this.menuItem1});
    // 
    // FormInvokeDialog
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(240, 105);
    this.Menu = this.mainMenu1;
    this.Name = "FormInvokeDialog";
    this.Text = "Parent Form";
    this.Resize += new System.EventHandler(this.FormInvokeDialog_Resize);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.FormInvokeDialog_Paint);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormInvokeDialog());
  }
  protected void FormInvokeDialog_Resize (object sender, System.EventArgs e)
  {
    Invalidate();
  }
  protected void FormInvokeDialog_Paint (object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    g.DrawString(dlgMsg, new Font("times New Roman", 24),Brushes.Blue, this.ClientRectangle);
  }
  protected void mnuModalBox_Click (object sender, System.EventArgs e)
  {
        DialogForm myForm = new DialogForm();
    myForm.Message = dlgMsg;
    myForm.ShowDialog(this);
    if(myForm.DialogResult == DialogResult.OK)
    {
      dlgMsg = myForm.Message;
      Invalidate();
    }
  }
}
public class DialogForm : System.Windows.Forms.Form
{
    private System.ruponentModel.Container components = null;
  private System.Windows.Forms.Button btnCancel;
  private System.Windows.Forms.Button btnOK;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.TextBox txtMessage;
    public DialogForm()
    {
        InitializeComponent();
    this.StartPosition = FormStartPosition.CenterParent;      
    }
  private string strMessage;
  public string Message
  {
    get{ return strMessage;}
    set
    { 
      strMessage = value;
      txtMessage.Text = strMessage;
    }
  }

  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
    private void InitializeComponent()
  {
    this.label1 = new System.Windows.Forms.Label();
    this.btnOK = new System.Windows.Forms.Button();
    this.btnCancel = new System.Windows.Forms.Button();
    this.txtMessage = new System.Windows.Forms.TextBox();
    this.SuspendLayout();
    // 
    // label1
    // 
    this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold);
    this.label1.Location = new System.Drawing.Point(12, 8);
    this.label1.Name = "label1";
    this.label1.Size = new System.Drawing.Size(240, 48);
    this.label1.TabIndex = 1;
    this.label1.Text = "Type in your message, and the main window will use it...";
    // 
    // btnOK
    // 
    this.btnOK.DialogResult = System.Windows.Forms.DialogResult.OK;
    this.btnOK.Location = new System.Drawing.Point(16, 104);
    this.btnOK.Name = "btnOK";
    this.btnOK.Size = new System.Drawing.Size(96, 24);
    this.btnOK.TabIndex = 2;
    this.btnOK.Text = "OK";
    this.btnOK.Click += new System.EventHandler(this.btnOK_Click);
    // 
    // btnCancel
    // 
    this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
    this.btnCancel.Location = new System.Drawing.Point(152, 104);
    this.btnCancel.Name = "btnCancel";
    this.btnCancel.Size = new System.Drawing.Size(96, 24);
    this.btnCancel.TabIndex = 3;
    this.btnCancel.Text = "Cancel";
    // 
    // txtMessage
    // 
    this.txtMessage.Location = new System.Drawing.Point(16, 72);
    this.txtMessage.Name = "txtMessage";
    this.txtMessage.Size = new System.Drawing.Size(232, 20);
    this.txtMessage.TabIndex = 0;
    this.txtMessage.Text = "";
    // 
    // DialogForm
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(266, 151);
    this.ControlBox = false;
    this.Controls.Add(this.btnCancel);
    this.Controls.Add(this.btnOK);
    this.Controls.Add(this.label1);
    this.Controls.Add(this.txtMessage);
    this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
    this.MaximizeBox = false;
    this.MinimizeBox = false;
    this.Name = "DialogForm";
    this.Text = "Some Custom Dialog";
    this.ResumeLayout(false);
  }
  protected void btnOK_Click (object sender, System.EventArgs e)
  {
    strMessage = txtMessage.Text;
  }
}

Dialog Apply Event Illustration

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class DialogApplyEvent : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnCreate;
  private System.Windows.Forms.Label lblReturn;
  public DialogApplyEvent()
  {
    InitializeComponent();
  }
  private void InitializeComponent()
  {
    this.btnCreate = new System.Windows.Forms.Button();
    this.lblReturn = new System.Windows.Forms.Label();
    this.SuspendLayout();
    // 
    // btnCreate
    // 
    this.btnCreate.Location = new System.Drawing.Point(72, 176);
    this.btnCreate.Name = "btnCreate";
    this.btnCreate.Size = new System.Drawing.Size(144, 23);
    this.btnCreate.TabIndex = 0;
    this.btnCreate.Text = "Create Dialog Box";
    this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
    // 
    // lblReturn
    // 
    this.lblReturn.Location = new System.Drawing.Point(88, 88);
    this.lblReturn.Name = "lblReturn";
    this.lblReturn.TabIndex = 1;
    // 
    // DialogApplyEvent
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.lblReturn,
                                             this.btnCreate});
    this.ResumeLayout(false);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DialogApplyEvent());
  }
  private void btnCreate_Click(object sender, System.EventArgs e)
  {
    DialogDemo dlg = new DialogDemo();
    dlg.EnableApplyButton = false;
    dlg.ClickApply += new EventHandler(DialogDemoOnApply);
    
    dlg.ShowDialog();
    
    if (dlg.DialogResult == DialogResult.OK)
      {lblReturn.Text = dlg.TextOut;}
    else
      {lblReturn.Text = dlg.DialogResult.ToString();}
  }
  
  private void DialogDemoOnApply(object sender, System.EventArgs e)
  {
    DialogDemo dlg = (DialogDemo)sender;
    lblReturn.Text = dlg.TextOut;
    dlg.EnableApplyButton = false;  
  }
}
class DialogDemo : Form
{
  private Button btnApply;
  private TextBox txt;
  public event EventHandler ClickApply;
  
  public DialogDemo()
  {
    FormBorderStyle = FormBorderStyle.FixedDialog;
    BackColor = System.Drawing.Color.Aquamarine;
    ControlBox = false;
    MaximizeBox = false;
    MinimizeBox = false;
    ShowInTaskbar = false;
    Size = new Size(400,200);
    StartPosition = FormStartPosition.CenterScreen;
    Button btnOK = new Button();
    btnOK.Text = "OK";
    btnOK.DialogResult = DialogResult.OK;
    btnOK.Location = new Point(50,50);
    btnOK.TabIndex = 0;
    btnOK.Click += new EventHandler(ApplyButtonOnClick);
    Controls.Add(btnOK);
    
    btnApply = new Button();
    btnApply.Text = "Apply";
    btnApply.Location = new Point(150,50);
    btnApply.TabIndex = 1;
    btnApply.Enabled = false;
    btnApply.Click += new EventHandler(ApplyButtonOnClick);
    Controls.Add(btnApply);
    
    Button btnCancel = new Button();
    btnCancel.Text = "Cancel";
    btnCancel.DialogResult = DialogResult.Cancel;
    btnCancel.Location = new Point(250,50);
    btnCancel.TabIndex = 2;
    Controls.Add(btnCancel);
    txt = new TextBox();
    txt.Size = new Size(100,15);
    txt.Location = new Point(150,15);
    txt.TextChanged += new EventHandler(TextBoxChanged);
    Controls.Add(txt);
    
  }
  
  private void TextBoxChanged(object sender, EventArgs e)
  {
    this.EnableApplyButton = true;  
  }
  public bool EnableApplyButton
  {
    get {return btnApply.Enabled; }
    set {btnApply.Enabled = value; }
  }
  
  public string TextOut
  {
    get {return txt.Text; }
  }
  
  private void ApplyButtonOnClick (object sender, System.EventArgs e)
  {
    if (ClickApply != null)
      ClickApply(this, new EventArgs());
  }
}

Dialog with two buttons

using System;
using System.Drawing;
using System.ruponentModel;
using System.Windows.Forms;
public class SimpleDialog : Form
{
  public SimpleDialog()
  {
    Button OkButton=new Button();
    OkButton.Text = "Ok";
    OkButton.DialogResult = DialogResult.OK;
    OkButton.Location = new Point(8,20);
    OkButton.Size = new Size(50,24);
    this.Controls.Add(OkButton);
    Button CancelButton=new Button();
    CancelButton.Text = "Cancel";
    CancelButton.DialogResult = DialogResult.Cancel;
    CancelButton.Location = new Point(64,20);
    CancelButton.Size = new Size(50,24);
    this.Controls.Add(CancelButton);
    this.Text="Dialog";
    this.Size = new Size(130,90);
    this.FormBorderStyle = FormBorderStyle.FixedDialog;
    this.StartPosition = FormStartPosition.CenterParent;
    this.ControlBox = false;
  }
}

public class SimpleDialogTest
{
  public static void Main(){
    SimpleDialog dlg = new SimpleDialog();
    if(dlg.ShowDialog() == DialogResult.OK)
      MessageBox.Show("You clicked Ok");
    else
      MessageBox.Show("You clicked Cancel");
  }
}

Set DialogResult in your own dialog class

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Resources;    
public class DialogCustomDialogResult : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnCreate;
  private System.Windows.Forms.Label lblReturn;
  public DialogCustomDialogResult()
  {
    InitializeComponent();
  }
  private void InitializeComponent()
  {
    this.btnCreate = new System.Windows.Forms.Button();
    this.lblReturn = new System.Windows.Forms.Label();
    this.SuspendLayout();
    // 
    // btnCreate
    // 
    this.btnCreate.Location = new System.Drawing.Point(80, 120);
    this.btnCreate.Name = "btnCreate";
    this.btnCreate.Size = new System.Drawing.Size(104, 23);
    this.btnCreate.TabIndex = 1;
    this.btnCreate.Text = "Create Dialog Box";
    this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
    // 
    // lblReturn
    // 
    this.lblReturn.Location = new System.Drawing.Point(64, 72);
    this.lblReturn.Name = "lblReturn";
    this.lblReturn.Size = new System.Drawing.Size(144, 23);
    this.lblReturn.TabIndex = 2;
    // 
    // DialogCustomDialogResult
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.lblReturn,
                                             this.btnCreate});
    this.ResumeLayout(false);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DialogCustomDialogResult());
  }
  private void btnCreate_Click(object sender, System.EventArgs e)
  {
    Form dlg = new MyDialog();
    dlg.Text = "Dialog Test";
    dlg.FormBorderStyle = FormBorderStyle.FixedDialog;
    dlg.FormBorderStyle = FormBorderStyle.Sizable;
    dlg.BackColor = Color.Azure;
    dlg.ControlBox = true;
    dlg.MaximizeBox = false;
    dlg.MinimizeBox = false;
    dlg.ShowInTaskbar = false;
    dlg.Icon = new Icon("1.ICO");
    dlg.Size = new Size(300,300);
    dlg.StartPosition = FormStartPosition.CenterScreen;
    dlg.ShowDialog();
    
    lblReturn.Text = dlg.DialogResult.ToString();
    switch (dlg.ShowDialog())
    {
      case DialogResult.Abort:
        lblReturn.Text = "Abort, Abort";
        break;
      case DialogResult.Cancel:
        lblReturn.Text = "You have cancelled.";
        break;
      case DialogResult.OK:
        lblReturn.Text = "I"m OK, You"re OK";
        break;
      default:
        lblReturn.Text = "Whatever...";
        break;
    }
    }
}
public class MyDialog : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnOK;
  private System.Windows.Forms.Button btnCancel;
  private System.Windows.Forms.TextBox textBox1;
  private System.Windows.Forms.LinkLabel linkLabel1;
  public MyDialog()
  {
    InitializeComponent();
  }
  private void InitializeComponent()
  {
    this.btnOK = new System.Windows.Forms.Button();
    this.btnCancel = new System.Windows.Forms.Button();
    this.textBox1 = new System.Windows.Forms.TextBox();
    this.linkLabel1 = new System.Windows.Forms.LinkLabel();
    this.SuspendLayout();
    // 
    // btnOK
    // 
    this.btnOK.DialogResult = System.Windows.Forms.DialogResult.OK;
    this.btnOK.Location = new System.Drawing.Point(56, 152);
    this.btnOK.Name = "btnOK";
    this.btnOK.TabIndex = 0;
    this.btnOK.Text = "Do It!";
    // 
    // btnCancel
    // 
    this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
    this.btnCancel.Location = new System.Drawing.Point(160, 152);
    this.btnCancel.Name = "btnCancel";
    this.btnCancel.TabIndex = 1;
    this.btnCancel.Text = "Cancel";
    // 
    // textBox1
    // 
    this.textBox1.Location = new System.Drawing.Point(112, 64);
    this.textBox1.Name = "textBox1";
    this.textBox1.TabIndex = 2;
    this.textBox1.Text = "textBox1";
    // 
    // linkLabel1
    // 
    this.linkLabel1.Location = new System.Drawing.Point(72, 112);
    this.linkLabel1.Name = "linkLabel1";
    this.linkLabel1.TabIndex = 3;
    this.linkLabel1.TabStop = true;
    this.linkLabel1.Text = "linkLabel1";
    // 
    // MyDialog
    // 
    this.AcceptButton = this.btnOK;
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.linkLabel1,
                                             this.textBox1,
                                             this.btnCancel,
                                             this.btnOK});
    this.Name = "MyDialog";
    this.Text = "dlg";
    this.ResumeLayout(false);
  }
  private void btnOK_Click(object sender, System.EventArgs e)
  {
    DialogResult = DialogResult.OK;
  }
  private void btnCancel_Click(object sender, System.EventArgs e)
  {
    DialogResult = DialogResult.Cancel;
  }
}