Types of Error's in Vs 2010

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.NET3.5

.NET

Visual-Studio

VS2010

Hi please helpbelow shown error when it comes.
describe types of error's , how can we adpot them.

provide me useful information.


Message :
A potentially dangerous Request.QueryString value was detected from the client (menu="alert('hi');...").

StackTrace :
at System.Web.HttpRequest.ValidateString(String s, String valueName, String collectionName)
at System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, String collectionName)
at System.Web.HttpRequest.get_QueryString()
at System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull)
at System.Web.UI.Page.DeterminePostBackMode()
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.reportmenu_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\iinfo_201404\acf2f2d7\308b3238\App_Web_epemyksf.5.cs:line 0
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)