if (fd.ShowDialog() != DialogResult.OK)
            {
                usersBindingSource.CancelEdit();
            }

          private skladEntities1 se;
          .........

            se = new skladEntities1(new Uri("http://localhost:2219/skladDataService.svc/"));

            usersBindingSource.DataSource = typeof(Users);
            foreach (Users us in (from ss in se.Users
                                  select ss))
            {
                usersBindingSource.Add(us);
            }

private EventHandler delegateDelete;
...

private void Form1_Load(object sender, EventArgs e)
        {
...
            SetNewClickForDelete();            
        }
...
void bindingNavigatorDeleteItemMyClick(object sender, EventArgs e)
        {
            if (MessageBox.Show("Вы уверены, что хотите удалить?", "", MessageBoxButtons.YesNo  , MessageBoxIcon.Question) == DialogResult.Yes)
            {
                if (delegateDelete != null)
                       delegateDelete(sender, e);
            }
        }
...
private void SetNewClickForDelete()
        {
            object sender = bindingNavigatorDeleteItem;

            FieldInfo fieldEventClick = typeof(ToolStripItem).GetField("EventClick", BindingFlags.NonPublic | BindingFlags.Static);
            object fieldEventClickValue = fieldEventClick.GetValue(sender);
            EventHandlerList handlerList = (EventHandlerList)sender.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(sender, new object[] { });
            Delegate delegates = handlerList[fieldEventClickValue];
           
            if (delegates != null)
            {
                foreach (Delegate targetDelegate in delegates.GetInvocationList())
                {
                    delegateDelete += (EventHandler) targetDelegate;
                    handlerList.RemoveHandler(fieldEventClickValue, targetDelegate);
                }
            }

            bindingNavigatorDeleteItem.Click += new EventHandler(bindingNavigatorDeleteItemMyClick);
}

BindingSource.DataSource = контекст.Users

imTextBox.DataBindings.Add("Text", MyObjectUser, "Im", true);

usersBindingSource.RemoveCurrent(); 

private void bindingNavigatorDeleteItem_Click(object sender, EventArgs e)
{
  if (MessageBox.Show("Вы уверены, что хотите удалить?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
  {
     myBindingSource.RemoveCurrent();
  }
}