Disable backspace in dgv combobox

Question

I would like to disable backspace and delete in a combo box in a dgv
I used the following
Private Sub frmWorkSelectionPopupAll_KeyDown(sender As Object, e As KeyEventArgs) Handles MyBase.KeyDown
If e.KeyCode = Keys.Delete And e.KeyCode = Keys.Back Then
e.Handled = True
End If
End Sub
Delete is disabled, backspace is not.
I have set the form KeyPreview to True.
Can you please suggest something?
John

Answer 1

The options for DisplayStyle are "ComboBox", "DropDownButton" and "Nothing". No luck with any of the 3.
Are you referring to something else?
I tried to replicate the issue by creating an app with a DataGridView and three columns. However I could not EDIT in the ComboBox column anything without using a special Sub routine to do that.
Nothing I tried would let me use the keyboard or mouse to do anything in the ComboBox. Except for using Edit Mode and AutoComplete in which AutoComplete is unecessary in your situation I would imagine. Then I could type a letter while over the ComboBox
and I suppose if something in the ComboBox's list matched it would display. But even then I couldn't backspace or anything else or actually alter text displayed by the ComboBox.
And I believe from this link
Problem with combobox and databound datagridview that this statement is entirely accurate "The ComboBox used by the DataGridViewComboBoxColumn has a DropDownStyle property set to ComboBoxStyle.DropDownList, but DataGridViewComboBoxColumn does
not expose this property, so out-of-box there is no way to type  text into a combobox column."
However at that link is code supplied which can not only provide the ability to edit text in a ComboBox in the ComboBox column but actually add new items to the ComboBox list (or alter it to remove items, whatever) which I used in the below code the Sub
that allows editing text in a ComboBox in a ComboBox column. So unless you are doing something along those lines I really don't know why you are having an issue. Nobody should be able to alter anything in the ComboBox's in the ComboBox column using the keyboard.
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
DataGridView1.EditMode = DataGridViewEditMode.EditOnEnter
DataGridView1.ColumnCount = 3
DataGridView1.Columns(0).Name = "Product ID"
DataGridView1.Columns(1).Name = "Product Name"
DataGridView1.Columns(2).Name = "Product Price"
Dim row As String() = New String() {"1", "Product 1", "1000"}
DataGridView1.Rows.Add(row)
row = New String() {"2", "Product 2", "2000"}
DataGridView1.Rows.Add(row)
row = New String() {"3", "Product 3", "3000"}
DataGridView1.Rows.Add(row)
row = New String() {"4", "Product 4", "4000"}
DataGridView1.Rows.Add(row)
Dim cmb As New DataGridViewComboBoxColumn()
cmb.DisplayStyle = DataGridViewComboBoxDisplayStyle.DropDownButton
cmb.FlatStyle = FlatStyle.Flat
cmb.AutoComplete = True
cmb.HeaderText = "Select Data"
cmb.Name = "cmb"
cmb.MaxDropDownItems = 4
cmb.Items.Add("Hello")
cmb.Items.Add("Goodbye")
cmb.Items.Add("Seriously?")
cmb.Items.Add("Not")
DataGridView1.Columns.Add(cmb)
End Sub
Private Sub DataGridView1_EditingControlShowing(sender As Object, e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView1.EditingControlShowing
'Allow user to enter new values for ALL DataGridViewComboBox controls in the DataGridView
If (TypeOf e.Control Is DataGridViewComboBoxEditingControl) Then
Dim cmb As DataGridViewComboBoxEditingControl = CType(e.Control, DataGridViewComboBoxEditingControl)
If Not cmb Is Nothing Then
cmb.DropDownStyle = ComboBoxStyle.DropDown
End If
End If
End Sub
End Class
La vida loca