Object reference not set to an instance of an object. More Detail Hide Detail System.NullReferenceException: Object reference not set to an instance of an object. at SessionCustom.get_UserId() at Reports_AlertMessage.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)