Hi,

I am using Infragistics Winform Controls 2008 Volume 1 and facing the problem in UltraComboBox. The error string is: 

Internal Error: "Can't convert to DestinitionValue in UltraComboBox".

Although I have lots of combo boc on my screen but only one combo box is showing this error.

I am using the following code to bind the combo box:

 cmbRegion.DataSource = LookupData.Regions (<<This is generic list of well defined objects>>)

                cmbRegion.DisplayLayout.Bands(0).Columns(RegionColumnData.REGION_CODE.Value).SortIndicator = Infragistics.Win.UltraWinGrid.SortIndicator.Ascending

                If (cmbRegion.Rows.Count > 0) Then

                    cmbRegion.SelectedRow = cmbRegion.Rows(0)

                End If

                cmbRegion.DisplayMember = RegionColumnData.DESCR.Value

                cmbRegion.ValueMember = RegionColumnData.REGION_CODE.Value

If in the above I am using REGION_ID as Value Member then there is no problem, the code runs fine but if I use REGION_CODE then it shows the above error. The only difference is REGION_CODE is String and REGION_ID is Integer.

I am using the same code to bindsome  other combo box also and setting the value member as Code instead of ID but they are working fine.

The stack trace of the problem is as follows:

at Infragistics.Win.EmbeddableEditorBase.GetDataFilteredDestinationValue(Object sourceVal, ConversionDirection direction, EmbeddableEditorOwnerBase owner, Object ownerContext)\r\n   

at Infragistics.Win.UltraWinGrid.UltraCombo.get_Value()\r\n   

at Infragistics.Win.UltraWinGrid.UltraGridComboEditorOwner.GetValue(Object ownerContext)\r\n   

at Infragistics.Win.EmbeddableEditorBase.GetDataFilterSourceValue(ConversionDirection direction, EmbeddableEditorOwnerBase owner, Object ownerContext)\r\n   

at Infragistics.Win.EmbeddableEditorBase.GetDataFilteredDestinationValue(ConversionDirection direction, Boolean& isValidConversion, EmbeddableEditorOwnerBase owner, Object ownerContext)\r\n   

at Infragistics.Win.EmbeddableEditorBase.GetDataFilteredDestinationValue(ConversionDirection direction, EmbeddableEditorOwnerBase owner, Object ownerContext)\r\n   

at Infragistics.Win.EditorWithCombo.GetElementText(EmbeddableUIElementBase element, Boolean ignorePasswordChar)\r\n   

at Infragistics.Win.EditorWithTextUIElement.PositionChildElements()\r\n   

at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)\r\n   

at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)\r\n   

at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)\r\n   

at Infragistics.Win.UIElement.DrawHelper(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Boolean clipText, Boolean forceDrawAsFocused, Boolean preventAlphaBlendGraphics)\r\n   

at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Size elementSize, Boolean preventAlphaBlendGraphics)\r\n   

at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode)\r\n   

at Infragistics.Win.UltraControlBase.OnPaint(PaintEventArgs pe)\r\n   

at Infragistics.Win.UltraWinGrid.UltraCombo.OnPaint(PaintEventArgs e)\r\n   

at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)\r\n   

at System.Windows.Forms.Control.WmPaint(Message& m)\r\n   

at System.Windows.Forms.Control.WndProc(Message& m)\r\n   

at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)\r\n   

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)\r\n   

at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)\r\n   

at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageA(MSG& msg)\r\n  

at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)\r\n   

at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)\r\n   

at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)\r\n   

at System.Windows.Forms.Application.Run(ApplicationContext context)\r\n   

at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()\r\n   

at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()\r\n   

at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)\r\n   

at BLAC.WinUI.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81\r\n   

at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)\r\n   

at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)\r\n   

at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()\r\n   

at System.Threading.ThreadHelper.ThreadStart_Context(Object state)\r\n   

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n   

at System.Threading.ThreadHelper.ThreadStart()"