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<%@ Page Language="C#" %>
<script runat="server">
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (rdlOther.Checked)
pnlOther.Visible = true;
else
pnlOther.Visible = false;
}
</script>
<html>
<head>
<title>Show Panel</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Select your favorite programming language:
<br /><br />
<asp:RadioButton
id="rdlVisualBasic"
GroupName="language"
Text="Visual Basic"
Runat="server" />
<br /><br />
<asp:RadioButton
id="rdlCSharp"
GroupName="language"
Text="C#"
Runat="server" />
<br /><br />
<asp:RadioButton
id="rdlOther"
GroupName="language"
Text="Other Language"
Runat="server" />
<br />
<asp:Panel
id="pnlOther"
Visible="false"
Runat="server">
<asp:Label
id="lblOther"
Text="Other Language:"
AssociatedControlID="txtOther"
Runat="server" />
<asp:TextBox
id="txtOther"
Runat="server" />
</asp:Panel>
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" OnClick="btnSubmit_Click" />
</div>
</form>
</body>
</html>
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