更新后：

出错页面是：http://localhost/index.aspx

异常信息：Exception of type 'System.Web.HttpUnhandledException' was thrown.

Source:System.Web

StackTrace:   at System.Web.UI.Page.HandleError(Exception e)   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)   at System.Web.UI.Page.ProcessRequest()   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)   at System.Web.UI.Page.ProcessRequest(HttpContext context)   at ASP.index_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\f74b3be0\8ad95294\App_Web_lyxggdmr.0.cs:line 0   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)