LOGIN FORM to Dot NET Application Form

This is a C# Practice code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Threading;


namespace dataentry
{
    public partial class Login : Form
    {
        public Login()
        {
            InitializeComponent();
        }
        SqlConnection connection = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }


        private void button11_Click(object sender, EventArgs e)
        {
            for (int beepcount = 0; beepcount <= 3; beepcount++)
            {
                Console.Beep();
                Thread.Sleep(1000);
            }
            SqlDataAdapter adapter = new SqlDataAdapter("select count(*) from LOGINWINDOW where USERNAME='" + username.Text + "' and PASS='" + password.Text + "'", connection);
            DataTable dt = new DataTable();
            adapter.Fill(dt);
            if (dt.Rows[0][0].ToString() == "1")
            {
                this.Hide();
                //Form1 f1 = new Form1();
                //f1.Show();
            }
            else
            {
                MessageBox.Show("incurect user name and password !!!");
            }
        }
    }
}

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