private void btn_login_Click(object sender, EventArgs e)
    {

        string conn = ("datasource=localhost;Initial Catalog='MyDb';username=root;password=blahblah");

        MySqlConnection con = new MySqlConnection(conn);
        MySqlCommand cmd = new MySqlCommand("select * from employees where BINARY usr_name=@name And BINARY usr_pwd=@pass", con);
        cmd.Parameters.AddWithValue("@name", txtUser.Text);
        cmd.Parameters.AddWithValue("@pass", txtPass.Text);

        con.Open();
        MySqlDataAdapter adpt = new MySqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        adpt.Fill(ds);
        con.Close();

        if (ds.Tables[0].Rows.Count > 0)
        {
            MessageBox.Show(" Login Successful.nn Welcome back " + txtUser.Text + "!");
        }
        else
        {
            MessageBox.Show(txtUser.Text + ", you entered an invalid username and/or password!nnPlease try again...");
        }
    }