System.Web.HttpException: Server cannot set content type after HTTP headers have been sent. at System.Web.HttpResponse.set_ContentType(String value) at System.Web.UI.Page.SetIntrinsics(HttpContext context, Boolean allowAsync) at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at System.Web.Mobile.ErrorHandlerModule.Application_Error(Object source, EventArgs e)