private void UserName_TextChanged(object sender, EventArgs e) { List <string> users; string name = UserName.Text; UserID.Items.Clear(); if (name != "") { users = con.getAllUsers(name); for (int i = 0; i < users.Count; i++) { UserID.Items.Add(users[i]); } if (users.Count > 0 && UserID.Text == "") { UserID.DroppedDown = true; } } else { UserID.Items.Clear(); UserID.Text = ""; UserID.DroppedDown = false; } }