Use RadioButton to set font size : RadioButton « ASP.net Controls « ASP.NET Tutorial

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ASP.NET Tutorial » ASP.net Controls » RadioButton 
3.13.2.Use RadioButton to set font size
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default_aspx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>RadioButton Control</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>RadioButton Control</h1>
     <br />
     <asp:Label ID="lblTime" runat="server" OnInit="lblTime_Init"></asp:Label>
     
     <br />
     <br />
     <asp:RadioButton ID="rdoSize10" runat="server" GroupName="grpSize" AutoPostBack="True" Text="10pt" OnCheckedChanged="grpSize_CheckedChanged" />
     <asp:RadioButton ID="rdoSize14" runat="server" GroupName="grpSize" AutoPostBack="True" Text="14pt" OnCheckedChanged="grpSize_CheckedChanged" />
     <asp:RadioButton ID="rdoSize16" runat="server" GroupName="grpSize" AutoPostBack="True" Text="16pt" OnCheckedChanged="grpSize_CheckedChanged" />

    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default_aspx : System.Web.UI.Page 
{

   protected void grpSize_CheckedChanged(object sender, EventArgs e)
   {
     if (rdoSize10.Checked)
       lblTime.Font.Size = 10;
     else if (rdoSize14.Checked)
       lblTime.Font.Size = 14;
     else lblTime.Font.Size = 16;
   }
   protected void lblTime_Init(object sender, EventArgs e)
   {
     lblTime.Font.Name = "Verdana";
     lblTime.Font.Size = 20;
     lblTime.Font.Bold = true;
     lblTime.Font.Italic = true;
     lblTime.Text = DateTime.Now.ToString();
   }
 }
3.13.RadioButton
3.13.1.Important properties, methods and events for RadioButton
3.13.2.Use RadioButton to set font size
3.13.3.Use AutoPostBack property to detect which RadioButton control is selected.
3.13.4.Get selected RadioButton
3.13.5.asp:RadioButton changed event (C#)
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