Login em C#

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;
using System.Data;


namespace LoginAndGestao
{
    public partial class Form1 : Form
    {

        SqlConnection conn = new SqlConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:-Users-André-Documents-login.mdb");
        SqlCommand comando = new SqlCommand();
        SqlDataReader dr;

        public Form1()
        {
            InitializeComponent();
        }
        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            comando.Connection = conn;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Deseja Sair?", "Sair", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                Application.Exit();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text != "" & textBox2.Text != "")
            {
                conn.Open();
                comando.CommandText = "INSERT INTO Login(Usuario, Senha) VALUES('" + textBox1.Text + "', '" + textBox2.Text + "')";
                comando.ExecuteNonQuery();
                conn.Close();

                textBox1.Text = "";
                textBox2.Text = "";
            }
        }


    }
}