DataGridViewComboBoxCell needs SelectedIndexChanged event

The following code example demonstrates how to use an DataGridView.EditingControlShowing event handler to add a handler for a DataGridViewComboBoxEditingControl event. In the example, the editing control is cast to a ComboBox to handle the ComboBox.SelectedIndexChanged event.

Private WithEvents dataGridView1 As New DataGridView()

Private Sub AddColorColumn()

Dim comboBoxColumn As New DataGridViewComboBoxColumn()
comboBoxColumn.Items.AddRange( _
Color.Red, Color.Yellow, Color.Green, Color.Blue)
comboBoxColumn.ValueType = GetType(Color)
dataGridView1.Columns.Add(comboBoxColumn)

End Sub

Private Sub dataGridView1_EditingControlShowing(ByVal sender As Object, _
ByVal e As DataGridViewEditingControlShowingEventArgs) _
Handles dataGridView1.EditingControlShowing

Dim combo As ComboBox = CType(e.Control, ComboBox)
If (combo IsNot Nothing) Then

' Remove an existing event-handler, if present, to avoid
' adding multiple handlers when the editing control is reused.
RemoveHandler combo.SelectedIndexChanged, _
New EventHandler(AddressOf ComboBox_SelectedIndexChanged)

' Add the event handler.
AddHandler combo.SelectedIndexChanged, _
New EventHandler(AddressOf ComboBox_SelectedIndexChanged)

End If

End Sub

Private Sub ComboBox_SelectedIndexChanged( _
ByVal sender As Object, ByVal e As EventArgs)

Dim comboBox1 As ComboBox = CType(sender, ComboBox)
comboBox1.BackColor = _
CType(CType(sender, ComboBox).SelectedItem, Color)

End Sub