Exception : Conversion from type `DBNull` to type `String` is not valid.
App Error Log : ControllerAppTier.GetCollection->WORKTERRAControllerAppTier.GetData->CollectionManager.GetCollection->CollectionManager.GetExportSchedulesByTypeCollectionFullCalender
Employee ID : 0
Action Name : ViewCalenderMonthly
Model : System.Web.Mvc.HandleErrorInfo
Controller : Customization
Web Error Log : at WORKTERRA.Shared.WORKTERRAControllerWebTier.GetCollection(ObjectType I_objectType, Hashtable I_criteria, String I_AdditionalCriteriaString, Object I_context, Boolean I_mode, Boolean I_needCollection) in d:\WT\branches\LB\Web\ControllerWebTier\ControllerWebTier\WORKTERRAControllerWebTier.cs:line 346
at WORKTERRA.Shared.Areas.Customization.Models.ViewCalenderModel.PopulateSchedule(Int32 CalenderViewType, String year, String month, String StartDay, String EndDay) in d:\WT\branches\LB\Web\Web Projects\WORKTERRA\Areas\Customization\Models\EDI\ViewCalenderModel.cs:line 73
at WORKTERRA.Shared.Areas.Customization.Controllers.CustomizationController.ViewCalenderMonthly(String Year, String Month, Int32 ViewType, Int32 FilterType, String StartDay, String EndDay) in d:\WT\branches\LB\Web\Web Projects\WORKTERRA\Areas\Customization\Controllers\EDI\ViewCalenderController.cs:line 33
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.b__12()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)