private void btnAddSupplier_Click(object sender, EventArgs e)
        {
            try
            {
                if (!GetConfirmation("Are you sure to add this Supplier?", "Confirm Add!!"))
                {
                    return;
                }

                Supplier supplier = new Supplier(txtSupplierName.Text.Trim(),
                                                 txtSupplierAddress.Text.Trim(),
                                                 txtSupplierPhoneNumber.Text.Trim(),
                                                 checkBoxIsActive.Checked);
                CustomResult customResult = bus.AddSupplier(supplier);
                if (customResult.Result == CustomResultType.Succeed)
                {
                    supplierDataGridView.Refresh();
                    MessageBox.Show("Supplier Added",
                                    "Inform", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    ClearSupplierTextBoxes();
                    ReloadAddSupplierProductBindingSource_Supplier();
                    txtSupplierName.Focus();
                }
                else if (customResult.Result == CustomResultType.InvalidModelState)
                {
                    validator.DisplayModelValidationErrorsAndFocus(supplier.GetType());
                }
                else if (customResult.Result == CustomResultType.InvalidInput)
                {
                    MessageBox.Show(customResult.ErrorMessage, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    txtSupplierPhoneNumber.Focus();
                }
                else
                {
                    throw new Exception(customResult.ErrorMessage);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                txtSupplierName.Focus();
            }
        }