C# asynchronous binding data implementation method

using System;
using ;
using ;
using ;
using ;
using ;
namespace WindowsApplication2
{
 public class AsyncCallBackOpeartion
 {
  private static DataGridView dataGridView;
  public static void AsyncCallBack(string connectionString, string sql, DataGridView dgv)
  {
   dataGridView = dgv;
   connectionString += ";Asynchronous Processing=true";
   SqlConnection conn = new SqlConnection(connectionString);
   SqlCommand command = new SqlCommand(sql, conn);
   ();
   (new AsyncCallback(AsyncCallBack), command);
  }
  static void AsyncCallBack(IAsyncResult ar)
  {
   if ()
   {
    SqlCommand com = (SqlCommand);
    SqlDataReader dr = (ar);
    DataTable dt = new DataTable();
    (dr);
    ();
    if ()
    {
     updateDG ur = new updateDG(dataBin);
     (ur, dt);
    }
   }
  }
  delegate void updateDG(DataTable dt);
  public static void dataBin(DataTable dt)
  {
    = dt;
  }
 }
}