RadioButton and CheckBox Methods

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C#2.0

C#

ASP.NET

Hi,

In my ASP.net website, i added RadioButton1 and CheckBox1,
I set the property of runat = "Server" .

I write code in methods RadioButton1_CheckedChanged and CheckBox1_CheckedChanged for RadioButton and CheckBox respectively.

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    Label1.Text = "any thing";
}


protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
    Label1.Text = "any thing";
}

but the caller never goes to these methods, Why???????