private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            using (Al_MujahidEntities context = new Al_MujahidEntities())
            {
                CUSTOMER customer = new CUSTOMER();
                if (this.pHONETextBox.Text.Equals(""))
                {
                    customer.PHONE = 0000;
                }
                else
                {
                    var phone = Convert.ToInt64(this.pHONETextBox.Text.ToString()); 
                    customer.PHONE = phone;
                }
                
                customer.COMPANY = this.cOMPANYTextBox.Text;
                context.CUSTOMERS.Add(customer);
                context.SaveChanges();
                Close();

            }
        }
 private void MenuItem_Click_3(object sender, RoutedEventArgs e)
 {
     CUSTOMER c = (CUSTOMER)cUSTOMERSDataGrid.SelectedItem;
     using (Al_MujahidEntities context = new Al_MujahidEntities())
     {
         MessageBox.Show(c.CUS_ID.ToString());
         var myObject = new CUSTOMER { CUS_ID = c.CUS_ID };
         context.CUSTOMERS.Attach(myObject);
         context.CUSTOMERS.Remove(myObject);
         context.SaveChanges();
         CUSTOMERS_Load();
     }
 }