c#checkbox 问题

protected void button1_click(object sender, EventArgs e){
CheckBox cb=new CheckBox();
cb.ID = "check" ;
Container.Controls.Add(cb);
check.Text=textbox.text ;
}
protected void button2_click(object sender, EventArgs e){
this.lable.text=check.text;

}

using System.Windows.Forms;

/*

 * Created by SharpDevelop.

 * User: jiacheo

 * Date: 2011/5/6

 * Time: 23:32

 * 

 * To change this template use Tools | Options | Coding | Edit Standard Headers.

 */

namespace zhidao

{

partial class MainForm

{

/// 

private System.ComponentModel.IContainer components = null;

/// 

/// true if managed resources should be disposed; otherwise, false.

protected override void Dispose(bool disposing)

{

if (disposing) {

if (components != null) {

components.Dispose();

}

}

base.Dispose(disposing);

}

/// 

private void InitializeComponent()

{

this.textBox1 = new System.Windows.Forms.TextBox();

this.button1 = new System.Windows.Forms.Button();

this.button2 = new System.Windows.Forms.Button();

this.label1 = new System.Windows.Forms.Label();

this.SuspendLayout();

// 

// textBox1

// 

this.textBox1.Location = new System.Drawing.Point(12, 12);

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(100, 21);

this.textBox1.TabIndex = 0;

// 

// button1

// 

this.button1.Location = new System.Drawing.Point(128, 12);

this.button1.Name = "button1";

this.button1.Size = new System.Drawing.Size(75, 23);

this.button1.TabIndex = 1;

this.button1.Text = "button1";

this.button1.UseVisualStyleBackColor = true;

this.button1.Click += new System.EventHandler(this.Button1Click);

// 

// button2

// 

this.button2.Location = new System.Drawing.Point(12, 51);

this.button2.Name = "button2";

this.button2.Size = new System.Drawing.Size(75, 23);

this.button2.TabIndex = 2;

this.button2.Text = "button2";

this.button2.UseVisualStyleBackColor = true;

this.button2.Click += new System.EventHandler(this.Button2Click);

// 

// label1

// 

this.label1.Location = new System.Drawing.Point(116, 51);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(100, 23);

this.label1.TabIndex = 3;

this.label1.Text = "label1";

// 

// MainForm

// 

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(409, 117);

this.Controls.Add(this.label1);

this.Controls.Add(this.button2);

this.Controls.Add(this.button1);

this.Controls.Add(this.textBox1);

this.Name = "MainForm";

this.Text = "zhidao";

this.ResumeLayout(false);

this.PerformLayout();

}

private System.Windows.Forms.Label label1;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.TextBox textBox1;

private CheckBox checkBox1 ;

void Button1Click(object sender, System.EventArgs e)

{

checkBox1 = new CheckBox();

checkBox1.Text = textBox1.Text;

checkBox1.Location = new System.Drawing.Point( 220, 12 );

this.Controls.Add(checkBox1);

}

void Button2Click(object sender, System.EventArgs e)

{

if(checkBox1!=null && checkBox1.Checked){

label1.Text = checkBox1.Text;

}

}

}

}