asp.net多按钮回发

<script language="javascript" type="text/javascript">
 <!--
 function __doPostBack(eventTarget, eventArgument) {
 var theform;
 if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
 theform = document.Form1;
 }
 else {
 theform = document.forms["Form1"];
 }
 theform.__EVENTTARGET.value = eventTarget.split("$").join(":");
 theform.__EVENTARGUMENT.value = eventArgument;
 theform.submit();
 }
 // -->
 </script>

也必须添加两个hidden的文本框到客户端，写到<form>中

<input type="hidden" name="__EVENTTARGET">

<input type="hidden" name="__EVENTARGUMENT">

后端.cs文件中的Page_Load添加：

TextBox1.Attributes.Add("onkeydown","javascript:if (13 == window.event.keyCode){__doPostBack('Button1','');return false;}");
   TextBox2.Attributes.Add("onkeydown","javascript:if (13 == window.event.keyCode){__doPostBack('Button2','');return false;}");