private void txtUsername_Leave(object sender, EventArgs e) { if (txtUsername.Text == "") { txtUsername.Text = "Username..."; } else { picUsernameStatus.Image = Properties.Resources.spinningWheel; RegisterModel registerModel = new RegisterModel(); bool taken = registerModel.checkUsername(txtUsername.Text); picUsernameStatus.Visible = true; if (!taken) { picUsernameStatus.Image = Properties.Resources.small_tick; } else { picUsernameStatus.Image = Properties.Resources.small_cross; lblUsernameTaken.Visible = true; } } }