Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 17:     public string DisplayLang {
Line 18:         get {
Line 19:             return Session["DisplayLang"].ToString();
Line 20:         }
Line 21:     }

Source File: d:\InetPub\www2019.archives.gov.mo\WebAS\masterpage\MasterPage.master.cs    Line: 19

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   WebAS_masterpage_MasterPage.get_DisplayLang() in d:\InetPub\www2019.archives.gov.mo\WebAS\masterpage\MasterPage.master.cs:19
   ASP.webas_masterpage_masterpage_master.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in d:\InetPub\www2019.archives.gov.mo\WebAS\masterpage\MasterPage.master:137
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +116
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11830528
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +46
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +78
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +49
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +249
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +78
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +249
   System.Web.UI.Page.Render(HtmlTextWriter writer) +38
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +78
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8752


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3282.0