C# login med sql

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 login
{
    public partial class Registration : Form

    {
        SqlConnection cn = new SqlConnection("Data Source=BEN-PC\\BENDB;Initial Catalog=User;Integrated Security=True");
        SqlCommand cmd;
        public Registration()
        {
            InitializeComponent();
        }

        private void Login_Click(object sender, EventArgs e)
        {

            try
            {
                cn.Open(); // Open connection
                cmd = new SqlCommand(" Insert into Users (Username,Passwords)  values ('" + textBox1.Text + "','" + textBox2.Text + "')", cn);
                MessageBox.Show("Successfull");
                cmd.ExecuteNonQuery();
                new Login().Show();
                
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        
        }
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    }
}