private void btnLogin_Click(object sender, EventArgs e)
        {
            int count = 0;
            Connection connection = new Connection();
            string sql = "SELECT * FROM tbl_Account WHERE Username='" + txtUserName.Text + "' and Password='" + txtPassword.Text + "'";
            MySqlConnection conn = new MySqlConnection(connection.ConnectionString);
            MySqlCommand cmd = new MySqlCommand(sql, conn);
            conn.Open();
            MySqlDataReader dr = cmd.ExecuteReader();

            while (dr.Read())
            {
                count++;
            }
            if (count == 1)
            {
                MessageBox.Show("Login Successfully!");
                this.Hide();
                main.showMeForm4(this);
            }
            else
            {
                txtPassword.Focus();
                MessageBox.Show("Username or Password Is Incorrect");
                txtUserName.Text = "";
                txtPassword.Text = "";

            }
            conn.Close();
        }