RadioButton OnCheckedChanged event in asp.net

How to use OnCheckedChanged event in RadioButton
RadioButtonOnCheckedChanged.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void RadioButton_CheckedChanged(object sender, System.EventArgs e)
    {
        if (RadioButton1.Checked == true)
        {
            Label1.Text = "You choose: " + RadioButton1.Text;
        }
        else
        {
            Label1.Text = "You choose: " + RadioButton2.Text;
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to use OnCheckedChanged event in RadioButton</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">RadioButton Example: OnCheckedChanged</h2>
        <asp:Label 
             ID="Label1"
             runat="server"
             Font-Bold="true"
             ForeColor="OliveDrab"
             Font-Size="Large"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2"
             runat="server"
             Font-Bold="true"
             ForeColor="Crimson"
             Text="Favorite Control?"
             >
        </asp:Label>
        <br />
        <asp:RadioButton 
             ID="RadioButton1" 
             runat="server"
             Text="ValidationSummary"
             GroupName="Controls"
             OnCheckedChanged="RadioButton_CheckedChanged"
             AutoPostBack="true"
             />
        <asp:RadioButton 
             ID="RadioButton2" 
             runat="server"
             Text="CompareValidator"
             GroupName="Controls"
             OnCheckedChanged="RadioButton_CheckedChanged"
             AutoPostBack="true"
             />
    </div>
    </form>
</body>
</html>








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