Another Simple Code for Login Form in C#

Code:

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

namespace DE_EXPERIMENT
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
           
           
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SqlConnection Con;
            Con = new SqlConnection(@"Data Source=DESKTOP-L87DR27;Initial Catalog=Experiment;Integrated Security=True");
            SqlCommand Cmd = new SqlCommand("select * from Exp where username = @username and password = @password", Con);
            Cmd.Parameters.AddWithValue("@username", textBox3.Text);
            Cmd.Parameters.AddWithValue("@password", textBox4.Text);
            Con.Open();
            SqlDataReader dr = Cmd.ExecuteReader();
            if (dr.HasRows == true)
            {
                MessageBox.Show("Okay");
            }
            else
            {
                MessageBox.Show("okay no");
            }

            Con.Close();
        }
    }

}