[InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.]
Microsoft.VisualBasic.CompilerServices.StringType.FromObject(Object Value) +894
Soureh_Cinema.WebModules.CommonOperation.FarsiNumber.FilterBase(DataTable& TableName, Int32 columnFilter) +149
SourehCinema.PeopleInFestival.Page_Load(Object sender, EventArgs e) +710
System.Web.UI.Control.OnLoad(EventArgs e) +106
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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