如何捕获这个异常，显示友好提示A potentially dangerous Request.Path value was detected from the
这个是.net4.0用来防止畸形URL攻击的功能，当使用恶意畸形URL访问时候，就会出现程序错误提示，我想保留这个功能，但是想显示出自己设计的友好提示页面，而不是系统错误页面，要在哪个位置捕获这个异常呢？环境是4.0 webform，谢谢！！


Exception information:
Exception type: HttpException
Exception message: A potentially dangerous Request.Path value was detected from the client (&).
at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()
at System.Web.HttpApplication.ValidateRequestExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 学习