说明：回调方法
参数：eventArgument,返回客户端回调参数值
Page.ClientScript.GetPostBackEventReference(control,string)
说明：客户端指定页面control控件中使用string字符串，以便回调回服务器
参数：control，实现PostBackOptions类，如控件,一般用this
string,指定字符串值
示例：
类文件：
using System;
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
namespace CustomControls
{
public class MyButton : Control, IPostBackEventHandler
{
private int i = 0;
//回调函数，回调参数值：eventArgument
public void RaisePostBackEvent(string eventArgument)
{
Context.Response.Write("第"+eventArgument+"次点击");
i = int.Parse(eventArgument);
}
//控件呈现，Control类重写，传送参数至客户端
protected override void Render(HtmlTextWriter output)
{
output.Write("<input type="button" name = " + this.UniqueID +
" Value = 'Click Me' onclick="javascript:"+Page.ClientScript.GetPostBackEventReference(this,(i+1).ToString())+""/>");
}
}
}
调用控件页面：using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
namespace CustomControls
{
public class MyButton : Control, IPostBackEventHandler
{
private int i = 0;
//回调函数，回调参数值：eventArgument
public void RaisePostBackEvent(string eventArgument)
{
Context.Response.Write("第"+eventArgument+"次点击");
i = int.Parse(eventArgument);
}
//控件呈现，Control类重写，传送参数至客户端
protected override void Render(HtmlTextWriter output)
{
output.Write("<input type="button" name = " + this.UniqueID +
" Value = 'Click Me' onclick="javascript:"+Page.ClientScript.GetPostBackEventReference(this,(i+1).ToString())+""/>");
}
}
}
<%@ Register TagPrefix="CustomControl" Namespace="CustomControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<CustomControl:MyButton runat="server" ID="Button">
</CustomControl:MyButton>
</div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<CustomControl:MyButton runat="server" ID="Button">
</CustomControl:MyButton>
</div>
</form>
</body>
</html>
注：
当UseSubmitBehavior 属性为 false 时，GetPostBackEventReference方法可以与Button控件一起使用
<%@ Register TagPrefix="CustomControl" Namespace="CustomControls" %>
注册使用自定义控件，TagPrefix指定控件前缀，Namespace指定控件所在命名空间调用自定义控件则如下
<TagPrefix指定名称:自定义控件类名></TagPrefix指定名称:自定义控件类名>
地址
http://www.cnblogs.com/ywkpl/archive/2007/12/14/995592.html