private void MetroButtonLogin_Click(object sender, EventArgs e)
        {
            DataSet1TableAdapters.UsersTableAdapter userAdapter = new DataSet1TableAdapters.UsersTableAdapter();
            DataTable dt = userAdapter.GetDataByUserAndPassword(metroTextBoxUser.Text, metroTextBoxPassword.Text);

            if (dt.Rows.Count > 0)
            {
                //Valid Login
                MessageBox.Show("Login Successful");
                UserID    = int.Parse(dt.Rows[0]["UserID"].ToString());
                loginFlag = true;
            }
            else
            {
                //Not Valid Login
                MessageBox.Show("Access Denied");
                loginFlag = false;
            }

            Close();
        }