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Problem with ComboBox CellType

Thread ID:





37603 Nov 28,2005 03:32 AM UTC Nov 28,2005 08:28 PM UTC WinForms 4
Tags: GridControl
Administrator [Syncfusion]
Asked On November 28, 2005 03:32 AM UTC

I have three cells with ‘Combobox” as their celltype in GDBG. I am using the following code for the combobox. Please see the code in attached file. Problem: If I don’t click on any cell on Column #1 and Column #2, then my Dropdown on column #3 works with no problem. But If I click on any cell of Column # 1 OR Column #2 first (basically click on dropdown list) then click on any cell of Column #3 I get the following error message. Type: System.NullReferenceException Message: Object reference not set to an instance of an object. Stack Trace: at Syncfusion.Windows.Forms.Grid.GridComboBoxCellModel.GetItemValue(Object dataSource, String valueMember, Object item) at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.SynchronizeDisplayText(Int32 index) at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.ListBoxMouseUp(Object sender, MouseEventArgs e) at System.Windows.Forms.Control.OnMouseUp(MouseEventArgs e) at Syncfusion.Windows.Forms.Grid.GridComboBoxListBoxPart.OnMouseUp(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ListBox.WndProc(Message& m) at Syncfusion.Windows.Forms.Grid.GridComboBoxListBoxPart.WndProc(Message& msg) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Please provide some help. thanks,


stanleyj [Syncfusion]
Replied On November 28, 2005 04:26 AM UTC

Hi VS, Can you modify this sample to show up the behavior? or can you upload your sample, we will try debugging it here. Best regards, Stanley

Administrator [Syncfusion]
Replied On November 28, 2005 05:00 PM UTC

I didn’t need to modify anything on my side. I am running Steps to reproduce: 1. Run the application 2. Select something from combobox from column 1 or Column2 3. Try to select something from column 3 4. Get the attached error Please do help.


Administrator [Syncfusion]
Replied On November 28, 2005 05:37 PM UTC

If you want to use both DataSource and ChoiceList comboboxes in the same grid, try registering a second combobox celltype. Here is the sample back modified to do this. http://www.syncfusion.com/Support/user/uploads/Forum_37603_e9adc5d5.zip

Administrator [Syncfusion]
Replied On November 28, 2005 08:28 PM UTC

Thanks Clay.


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