Request.Form error in asp.net

[DavidC]

We have a web page that displays dated notes kept in SQL table. The users
have apparently done a copy/paste of email content into the nvarchar(max)
column. Now, when we read it in edit on a web form we are getting the error
below. Can anyone help us avoid this issue as the web page crashes. Thanks.

An unhandled exception occurred:
Message: A potentially dangerous Request.Form value was detected from the
client (ctl00$ContentMain$fvActivityHistory$txtActivityNotes="...g, Teresa
<[email protected]> w...").

Stack Trace:
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_Form()
at System.Web.HttpRequest.get_HasForm()
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.activitynotes_aspx.ProcessRequest(HttpContext context)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)

 

[Mark Rae [MVP]]

Can anyone help us avoid this issue as the web page crashes.

There are hundreds (maybe thousands) of web pages which describe this
behaviour and, more importantly, how to work round it:
http://tinyurl.com/2ewzrvc