private void btnLogin_Click(object sender, EventArgs e)
        {
            string userName = txtUserName.Text;
            string passWord = txtPassWord.Text;
            if(Login(userName , passWord))
            {
                this.Hide();

                fTableManager f = new fTableManager();
                f.ShowDialog();

                this.Show();
            }
            else
            {
                MessageBox.Show("Sai ten tai khoan hoac mat khau!");
            }

        }

        bool Login(string userName, string passWord)
        {
            return AccountDAO.Instance.Login(userName, passWord);
        }

2)Class Account DAO

 public bool Login(string userName, string passWord)
        {
            //Cách 1
            //string query = "select * from dbo.Account where UserName = N'" + userName + "' and PassWord = '" + passWord + "'";
            //DataTable result = DataProvider.Instance.ExecuteQuery(query);

            //Cách 2
            string query = "exec USP_Login @userName , @passWord";
            DataTable result = DataProvider.Instance.ExecuteQuery(query, new object[] { userName, passWord });          



            return result.Rows.Count > 0;
        }
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USE QuanLyQuanCafe
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'USP_Login') AND type in (N'P', N'PC'))
  DROP PROCEDURE [dbo].[USP_Login]
GO
CREATE PROCEDURE USP_Login
@userName nvarchar(100),@passWord nvarchar(100)
AS
BEGIN
    select * from dbo.Account WHERE UserName = @userName and Password = @passWord;
END
GO
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EXEC USP_Login 'K9', 1
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