Protected Sub ReportViewer1_ReportError(ByVal sender As Object, ByVal e As Microsoft.Reporting.WebForms.ReportErrorEventArgs) Handles ReportViewer1.ReportError 

        If TypeOf e.Exception Is AspNetSessionExpiredException Then 

        e.Handled = True 

        Session.Abandon() 

        FormsAuthentication.SignOut() 

        Response.Redirect(FormsAuthentication.LoginUrl, True) 

        Else 

        e.Handled = False 

        End If 

        End Sub