Use RadioButton to set font size : RadioButton « ASP.net Controls « ASP.NET Tutorial
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<%@ 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();
}
}