Set DialogResult in your own dialog class : Dialog « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. Dialog

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
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;
  }
}

23.52.Dialog
	23.52.1.	Call ShowDialog on Form object
	23.52.2.	About DialogBox
	23.52.3.	Define your own dialog box
	23.52.4.	Dialog Apply Event Illustration
	23.52.5.	Define Apply Button action method in dialog class
	23.52.6.	Set DialogResult in your own dialog class
	23.52.7.	Create a custom dialog with radio button group
	23.52.8.	Dialog with two buttons