private void button_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                bl.AddBranch(br);
                MessageBox.Show("branch name: " + br.branchName + " branch number: " + br.branchNumber + " was added");
                //MessageBox.Show("הוסף בהצלחה" + br.branchName + " סניף ");

                br = new BE.Branch();
                this.DataContext             = br;
                hechsherComboBox.DataContext = "";
                mycityComboBox.DataContext   = "";
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }