private void login_Click(object sender, EventArgs e) { var validation = instanceOfSingleton.ProcessData(username.Text, password.Text); if (validation.Equals(ValidationState.True)) { this.Close(); } else if (validation.Equals(ValidationState.False)) { errorInfo.Text = "Wrong Credentials!"; errorInfo.Visible = true; } else { errorInfo.Text = "Something went wrong"; errorInfo.Visible = true; } }