Here is the code in the Event Handler private void cboCMs_EventHandler(object sender, EventArgs e) { ComboBox box = sender as ComboBox; box.SuspendLayout(); switch (box.Text) { case "Barbara": box.BackColor = System.Drawing.Color.LightBlue; break; case "Gretchen": box.BackColor = System.Drawing.Color.LightGreen; break; case "Sabrina": box.BackColor = System.Drawing.Color.LightYellow; break; case "Joanne": box.BackColor = System.Drawing.Color.LightPink; break; case "Not Played": box.BackColor = System.Drawing.Color.LightSalmon; break; case "No CM": box.BackColor = System.Drawing.Color.Magenta; break; case "No BR": box.BackColor = System.Drawing.Color.MediumOrchid; break; default: break; } box.Update(); box.ResumeLayout(); }