C# Login With User Authentication

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 AuthenticationLogin
{
    public partial class Login : Form
    {
        public Login()
        {
            InitializeComponent();
        }
        SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void button1_Click(object sender, EventArgs e)
        {
            SqlDataAdapter sdf = new SqlDataAdapter("select status from login where username='"+textBox1.Text+"' and Pass='"+textBox2.Text+"' ", con);
            DataTable dt = new DataTable();
            sdf.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();
                   
                }
                else if (dt.Rows[0][0].ToString() =="Student")
                {
                    Student f1 = new Student(dt.Rows[0][0].ToString());
                    f1.Show();
                }
                else if (dt.Rows[0][0].ToString() == "Client")
                {
                    Client f1 = new Client(dt.Rows[0][0].ToString());
                    f1.Show();
                }
            }
        }
    }
}

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