Get panel from button inside and change TableLayoutPanel cell color

Question

I have a TableLayoutPanel, panel in each cell, 2 RadioButton in each panel. When I checked the RadioButton, the cell color will change. I know I can do it with assign CheckedChanged event to each RadioButton and hardcode the cell row and column to change the color. I have 15 panels, so will have 30 different CheckedChanged event.

Is there any way that I can use the sender(RadioButton) to get its panel? So that I can use GetCellPosition(panel) to get the cell and use the panel to get which RadioButton in it is checked. Then I can just assign this event to all RadioButtons.

Answer 1

That can be achieved by using the Control.Parent property.

Your code should look something like this:

Private Sub RBs_CheckedChanged(sender As Object, e As EventArgs) Handles RadioButton1.CheckedChanged,
                                                                         RadioButton2.CheckedChanged,
                                                                         ' ...etc.
    Dim rb = DirectCast(sender, RadioButton)
    Dim pnl = DirectCast(rb.Parent, Panel)
    
    ' TODO: Do something with pnl and/or rb.
    Console.WriteLine(pnl.Name)
End Sub

Do note, however, that selecting a certain RadioButton will trigger the CheckedChanged event for two RBs; the one that got checked and the one the got unchecked. So, you might want to wrap your code inside If rb.Checked Then ... End If or whatever is appropriate.