Server Error in '/' Application.

Operator is not defined for type 'DBNull' and string "".

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.InvalidCastException: Operator is not defined for type 'DBNull' and string "".

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidCastException: Operator is not defined for type 'DBNull' and string "".]
   Microsoft.VisualBasic.CompilerServices.ObjectType.ObjTst(Object o1, Object o2, Boolean TextCompare) +3102
   Soureh_Cinema.WebModules.CommonOperation.FarsiNumber.SetNumOfIterationBase(DataTable& dt, Int32 columnIndexProcess, Int32 columnindexResault) +205
   SourehCinema.PeopleInFestival.Page_Load(Object sender, EventArgs e) +750
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3930.0