How to Detect ComboBox Selected Value in DataGridView

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Detecting the selected value of ComboBox is done by using the event like SelectedIndexChanged, SelectedValueChanged, and SelectionChangeCommitted. This event is being fired once you select a value in a ComboBox.

However, if you have a ComboBox column in DataGridView control, you cannot easily use those events without adding a Handler. So, in this case, you need to create a procedure that will listen as an event to a handler that you have created.

Here’s an example code on how to detect the selected value of a ComboBox column in DataGridView control.

  1. Private Sub ProductDetailDataGridView_EditingControlShowing(sender As Object, e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles ProductDetailDataGridView.EditingControlShowing
  2. Dim combo As ComboBox = TryCast(e.Control, ComboBox)
  3.  
  4. If combo IsNot Nothing Then
  5. RemoveHandler combo.SelectionChangeCommitted, AddressOf ComboBox_SelectionChangeCommitted
  6. AddHandler combo.SelectionChangeCommitted, AddressOf ComboBox_SelectionChangeCommitted
  7. End If
  8. End Sub
  9.  
  10. Private Sub ComboBox_SelectionChangeCommitted(sender As Object, e As EventArgs)
  11. Dim cb As ComboBox = DirectCast(sender, ComboBox)
  12. Dim strValue As String = cb.Text
  13.  
  14. If strValue IsNot Nothing Then
  15. MessageBox.Show(strValue)
  16. End If
  17. End Sub

In the example above, we created a procedure called ComboBox_SelectionChangeCommitted. This event is being fired once you select a value in ComboBox inside a DataGridView control. This procedure listens to an event after you declare a new handler AddHandler combo.SelectionChangeCommitted, AddressOf ComboBox_SelectionChangeCommitted

I used the SelectionChangeCommitted to prevent the event from firing when you select another row in DataGridView control.


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