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 51: 
Line 52:             var cntn = (from mm in db.LeftMenus where mm.RowId == Convert.ToInt32(mID) select new { mm.MenuContent }).FirstOrDefault();
Line 53:             if (cntn.MenuContent.Contains("((") && cntn.MenuContent.Contains("))"))
Line 54:             {
Line 55:                 Session["Content1"] = cntn.MenuContent; ;

Source File: d:\ASPX_Sites\HomeShowCenter\ExhContent.aspx    Line: 53

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   ASP.exhcontent_aspx.Page_Load(Object sender, EventArgs e) in d:\ASPX_Sites\HomeShowCenter\ExhContent.aspx:53
   System.Web.UI.Control.OnLoad(EventArgs e) +107
   System.Web.UI.Control.LoadRecursive() +89
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0