private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
  
         string sql = @"select firstname, lastname from employee ";

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
         da.Fill(dataSet1, "employee");
         DataTable dt = dataSet1.Tables["employee"];

         listBox1.DataSource = dt;
         listBox1.DisplayMember = "firstname";

         textBox1.DataBindings.Add("text", dt, "firstname");

         textBox2.DataBindings.Add("text", dt, "lastname");

      }
    }