GDBG Error

[Administrator]

1) I have initialized my column as
GDBG1.Model.ColStyles(1).CellType = "ComboBox" and
GDBG1.Model.ColStyles(1).DropDownStyle = Exclusive

2) Then in CurrentCellShowingDropDown, I set the Datasource with a DataTable that changes every time.
Dim cr As GridComboBoxCellRenderer = CType(cc.Renderer, GridComboBoxCellRenderer) ''
If Not (cr Is Nothing) Then
If cr.ListBoxPart.DataSource Is Nothing Then
cr.ListBoxPart.DataSource = GetNewDataTable
cr.ListBoxPart.DisplayMember = "Name"
cr.ListBoxPart.ValueMember = "Name"

End If

End If

3. When trying to enter a value in this column, as soon as I hit the keyboard, I get this error.

What am I doing wrong.

Help me!.
Thanks,
Bits

Getting the following exception:

Object reference not set to an instance of an object.
at Syncfusion.Windows.Forms.Grid.GridComboBoxListBoxHelper.GetItemCount()
at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.SyncControlValue(Int32 index)
at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.set_TextBoxText(String value)
at Syncfusion.Windows.Forms.Grid.GridTextBoxCellRenderer.SetTextBoxText(String s, Boolean validate)
at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.SetComboBoxText(String s, Boolean validate, Int32 index)
at Syncfusion.Windows.Forms.Grid.GridComboBoxCellRenderer.OnKeyPress(KeyPressEventArgs e)
at Syncfusion.Windows.Forms.Grid.GridCellRendererBase.ProcessKeyEventArgs(Message& m)
at Syncfusion.Windows.Forms.Grid.GridCellRendererBase.RaiseProcessKeyEventArgs(Message& m)
at Syncfusion.Windows.Forms.Grid.GridControlBase.ProcessKeyEventArgs(Message& m)
at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
at Syncfusion.Windows.Forms.Grid.GridControlBase.ProcessKeyMessage(Message& m)
at System.Windows.Forms.Control.WmKeyChar(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at Syncfusion.Windows.Forms.ScrollControl.WndProc(Message& msg)
at Syncfusion.Windows.Forms.Grid.GridControlBase.WndProc(Message& msg)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at System.Windows.Forms.Form.ShowDialog()
at CCM.frmExplorer.LoadSchedulerForm() in C:\Citi\VB.Net\DEV\CCMKERNEL\frmExplorer.vb:line 7238
at CCM.frmExplorer.mnuPopExplorerSchedule_Click(Object sender, EventArgs e) in C:\Citi\VB.Net\DEV\CCMKERNEL\frmExplorer.vb:line 7244

[Administrator]

Two things.

In a GridDataBoundGrid, you initialize column styles using the GirdBoundColumn objects for the column (actually, the GridBoundColumn.StyleInfo objects). You get these objects either from grid.GridBoundColumns or grid.Binder.InternalColumns depending upon whether you have explicitly set up GridBoundColumns or not.

Also, I do not think you will get the CurrentCellShowingDropdown event if the DataSource is nothing (as the grid thinks there is nothing to drop). So, you should try setting some DataSource/DisplayMember/ValueMember in the GridBoundColumn.StyleInfo object to start with. Then in CurrentCellShowingDropDown, do not check whether cr.ListBoxPart.DataSource is Nothing. You could just change it, or you could check if the current DataSource is not what you want it to be, and then change it if necessary.

[Administrator]

Clay,

You are Great! It worked like a charm. :)

Now I wonder, is this the correct method to access cellvalue in GDBG.
Me.GDBG(cc.RowIndex, GDBG.Model.NameToColIndex("ColName")).CellValue.ToString

Thanks a lot,
Bits.

[Administrator]

As long as the particular cell is not being actively edited, then your code should be OK.

If the cell is being edited, your code would return the old value and not necessarily the new value. In this case, you can use grid.CurrentCell.Renderer.ControlText to get the text from the currently editing cell.

[Administrator]

Thanks a lot. :)