I am getting "it is read only" error when I am trying to use " if (Request.IsAuthenticated=false) "

hi,


I am trying to use, if (Request.IsAuthenticated=false)


but while using it I am geting the error,

CS0200: Property or indexer 'System.Web.HttpRequest.IsAuthenticated' cannot be assigned to -- it is read only


Could anyone please help

Digish ...