C# Code for User Login in .net

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;




namespace dataentry
{
    public partial class UserLogin : Form
    {
        public UserLogin()
        {
            InitializeComponent();
        }
        SqlConnection asdf = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void button11_Click(object sender, EventArgs e)
        {
            SqlDataAdapter asd = new SqlDataAdapter("select status from login where UserName='" + username.Text+ "' and pass='"+password.Text+"'", asdf);
            DataTable dt = new DataTable();
            asd.Fill(dt);
            if(dt.Rows.Count==1)
            {
                if (dt.Rows[0][0].ToString() == "Master")
                {
                    Form1 f1 = new Form1(dt.Rows[0][0].ToString());
                    f1.Show();
                }
               
            }
        }


        private void username_TextChanged(object sender, EventArgs e)
        {


        }
    }
}

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