javascript代码：

function doubleCheck(){

if (window.document.readyState != null &&

window.document.readyState != 'complete')

{

alert("正在处理，请等待！");

return false;

}

else

{

MessageClear();

return true;

}

}

在C#代码中：

this.backButton.Attributes["onClick"] = "return doubleCheck()";

http://www.cnblogs.com/dahuzizyd/archive/2007/01/04/javascript_double_click.html