EvaluateException: Cannot perform '=' operation on System.String and System.Int32.
StackTrace:
   at System.Data.BinaryNode.SetTypeMismatchError(Int32 op, Type left, Type right)
   at System.Data.BinaryNode.BinaryCompare(Object vLeft, Object vRight, StorageType resultType, Int32 op, CompareInfo comparer)
   at System.Data.BinaryNode.EvalBinaryOp(Int32 op, ExpressionNode left, ExpressionNode right, DataRow row, DataRowVersion version, Int32[] recordNos)
   at System.Data.BinaryNode.Eval(DataRow row, DataRowVersion version)
   at System.Data.DataExpression.Invoke(DataRow row, DataRowVersion version)
   at System.Data.Index.InitRecords(IFilter filter)
   at System.Data.DataTable.GetIndex(IndexField[] indexDesc, DataViewRowState recordStates, IFilter rowFilter)
   at System.Data.DataView.UpdateIndex(Boolean force, Boolean fireEvent)
   at System.Data.DataView.SetIndex2(String newSort, DataViewRowState newRowStates, IFilter newRowFilter, Boolean fireEvent)
   at System.Data.DataView.SetIndex(String newSort, DataViewRowState newRowStates, IFilter newRowFilter)
   at System.Data.DataView.set_Sort(String value)
   at MS.Internal.Data.SynchronizationInfo.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
   at System.Windows.Data.BindingOperations.AccessCollection(IEnumerable collection, Action accessMethod, Boolean writeAccess)
   at System.Windows.Data.BindingListCollectionView.RefreshOverride()
   at System.Windows.Data.CollectionView.RefreshInternal()
   at System.Windows.Data.CollectionView.EndDefer()
   at System.Windows.Data.CollectionView.DeferHelper.Dispose()
   at System.Windows.Controls.ItemCollection.DeferHelper.Dispose()
   at System.Windows.Controls.DataGrid.DefaultSort(DataGridColumn column, Boolean clearExistingSortDescriptions)
   at System.Windows.Controls.DataGrid.OnSorting(DataGridSortingEventArgs eventArgs)
   at System.Windows.Controls.DataGrid.PerformSort(DataGridColumn sortColumn)
   at System.Windows.Controls.Primitives.DataGridColumnHeader.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Primitives.DataGridColumnHeader.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)