Server Error in '/Rack' Application.

A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtAddress="  <a href="QuestionAst...").

Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtAddress="  <a href="QuestionAst...").

Source Error:

[No relevant source lines]

Source File: c:\windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\182115aea\ee3235f91\App_Web_contact-details.aspx.cdcab7d2.-pbow_x8.0.cs Line: 0

Stack Trace:

[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$txtAddress="&nbsp; <a href="QuestionAst...").]
   System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +9665149
   System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection) +184
   System.Web.HttpRequest.get_Form() +55
   System.Web.HttpRequest.get_HasForm() +9666735
   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +95
   System.Web.UI.Page.DeterminePostBackMode() +69
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
   System.Web.UI.Page.ProcessRequest() +72
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +58
   ASP.contact_details_aspx.ProcessRequest(HttpContext context) in c:\windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\ver1\18153aea\ee323f91\App_Web_contact-details.aspx.cdcab7d2.-pbow_x8.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17929

This Error Occurs When I Type Special Characters In Text Box (i.e., <% = > etc)

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Wednesday 17 July 2013