public void Dispose()
 {
     using (AirlineDBEntities db = new AirlineDBEntities())
     {
         db.Dispose();
     }
 }
 /// <summary>
 /// throwing out unmanaged or managed depends upon the bool type
 /// </summary>
 /// <param name="disposing"></param>
 protected override void Dispose(bool disposing)
 {
     //if boolean is true dispose will release both managed and unmanaged rsource
     if (disposing)
     {
         db.Dispose();
     }
     //else dispose will release only unmanaged resource
     base.Dispose(disposing);
 }