public class bns
    {
private bonus_id Bonus;

public void Write()
        {
          
            var db = new DbEntities();         
            if (Bonus != null)
            {
                Bonus.Account_N = Acc;
                Bonus.Partner_N = PartKod;
                Bonus.State = 1;
                db.SaveChanges();
              
            }
}
 private void checkId()
        {
 var db = new DbEntities();
            var ite = db.bonus_id.Where(p => p.Client_ID == Id).Select(p => p);
            if (ite.Count() == 0) return;
            var item = ite.First();
            Bonus = item;
        }
     }