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How to change from button post back to autopostback

Posted By:      Posted Date: September 21, 2010    Points: 0   Category :ASP.Net
Can anyone help me with how to change from an update button to an autopostback, so that every time the info is changed it will be updated.

<%@ Page language="c#" Inherits="GreetingCardMaker.GreetingCardMaker" CodeFile="NewGreetingCardMaker.aspx.cs" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html xmlns="http://www.w3.org/1999/xhtml">
		<title>Greeting Card Maker</title>
		<form runat="server">
			<div style="BORDER-RIGHT: thin ridge; PADDING-RIGHT: 20px; BORDER-TOP: thin ridge; PADDING-LEFT: 20px; FONT-SIZE: x-small; PADDING-BOTTOM: 20px; BORDER-LEFT: thin ridge; WIDTH: 293px; PADDING-TOP: 20px; BORDER-BOTTOM: thin ridge; FONT-FAMILY: Verdana; HEIGHT: 486px; BACKGROUND-COLOR: lightyellow">Choose 
				a background color:<br />
				<asp:DropDownList id="lstBackColor" Height="22px" Width="194px" runat="server">

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