private void Edit_Button_Click(object sender, EventArgs e)
        {
            //check if some row is selected
            if (Customers_DataGridView.CurrentRow == null)
            {
                Alert.DisplayError("No item selected!");
                return;
            }
            //unpack entity from row and proceed Customer Editor
            CustomerEditor EditCustomerWindow = new CustomerEditor((Client)Customers_DataGridView.CurrentRow.DataBoundItem);

            EditCustomerWindow.ShowDialog();
        }
        private void AddNewCustomer_Button_Click(object sender, EventArgs e)
        {
            CustomerEditor addNewCustomerWindow = new CustomerEditor();

            addNewCustomerWindow.ShowDialog();
        }