private void btnAddMainlandPayCost_Click(object sender, EventArgs e)
        {
            FormPayImportLogisticsCost form = new FormPayImportLogisticsCost();

            form.Logistics = this.MainlandLogistics.CostPayItems;
            form.ShowDialog();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            FormPayImportLogisticsCost form = new FormPayImportLogisticsCost();

            form.Logistics = this.HongkongLogistics.CostPayItems;
            form.ShowDialog();
        }