Your description makes no sense, and you're not describing a problem at all.
This code will not work. The sender is THE ONE control you clicked on. It cannot be both a Button and a Label at the same time.
void btn_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
Label Label = (Label)sender;
If you use the button as the control that was clicked on, you have no good way of determining which label control is sitting next to the button.