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Form2.cs：Code Content
							using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace SimpleWinApp
{
	/// <summary>
	/// Summary description for Form2.
	/// </summary>
	public class Form2 : System.Windows.Forms.Form
	{
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.Button button3;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		public Form2()
		{
			//
			// 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 );
		}
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new Form2());
    }
		#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.button1 = new System.Windows.Forms.Button();
      this.button2 = new System.Windows.Forms.Button();
      this.button3 = new System.Windows.Forms.Button();
      this.SuspendLayout();
      // 
      // button1
      // 
      this.button1.Location = new System.Drawing.Point(72, 48);
      this.button1.Name = "button1";
      this.button1.Size = new System.Drawing.Size(80, 23);
      this.button1.TabIndex = 0;
      this.button1.Text = "Show Form 2";
      this.button1.Click += new System.EventHandler(this.button1_Click);
      // 
      // button2
      // 
      this.button2.Location = new System.Drawing.Point(72, 88);
      this.button2.Name = "button2";
      this.button2.Size = new System.Drawing.Size(80, 23);
      this.button2.TabIndex = 1;
      this.button2.Text = "Exit";
      this.button2.Click += new System.EventHandler(this.button2_Click);
      // 
      // button3
      // 
      this.button3.Location = new System.Drawing.Point(72, 136);
      this.button3.Name = "button3";
      this.button3.Size = new System.Drawing.Size(80, 23);
      this.button3.TabIndex = 2;
      this.button3.Text = "Show Dialog";
      this.button3.Click += new System.EventHandler(this.button3_Click);
      // 
      // Form2
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 271);
      this.Controls.Add(this.button3);
      this.Controls.Add(this.button2);
      this.Controls.Add(this.button1);
      this.Name = "Form2";
      this.Text = "Form2";
      this.ResumeLayout(false);
    }
		#endregion
    private void button1_Click(object sender, System.EventArgs e)
    {
      Form1 frm = new Form1();
      frm.Show();
    }
    private void button2_Click(object sender, System.EventArgs e)
    {
      Application.Exit();
    }
    private void button3_Click(object sender, System.EventArgs e)
    {
      Phone frm = new Phone();
      
      while(true)
      {
        frm.ShowDialog();
        if(frm.DialogResult == DialogResult.OK)
        {
          MessageBox.Show("Phone number is " + frm.PhoneNumber);
          if(frm.PhoneNumber.Length == 8 | frm.PhoneNumber.Length == 12)
          {
            break;
          }
          else
          {
            MessageBox.Show("Phone number was not formatted correctly.");
          }
        }
        else if(frm.DialogResult == DialogResult.Cancel)
        {
          MessageBox.Show("Form was canceled.");
          break;
        }
      }
      frm.Close();
    }
	}
}

						