private void editCustomer_Click(object sender, EventArgs e)
        {
            if (mKH == string.Empty)
            {
                MessageBox.Show(" You do not choice any Customer To Edit");

            }
            else
            {

                reset();
                CustomerEdit cusEdit = new CustomerEdit(c);
                cusEdit.Show();
                this.Visible = false;
            }
        }
        private void btnEditCustomer_Click(object sender, EventArgs e)
        {
            Customer cus = new Customer()
            {
                Id = txtCustomerId.Text,
                Name = txtCustomerName.Text,
                Address = txtAddress.Text,
                Cmnd = txtCMND.Text,
                Phonenumber = txtPhone.Text
            };

            CustomerEdit cusEdit = new CustomerEdit(cus);
            cusEdit.EditCompletedHandler += FormCustomerEdit_Completed;
            cusEdit.ShowDialog();
        }