private void grdVouchers_RowDeleting(object sender, System.Web.UI.WebControls.GridViewDeleteEventArgs e)
{
int voucherId = (int)this.grdVouchers.DataKeys[e.RowIndex].Value;
if (VoucherHelper.GetVoucherItemAmount(voucherId) > 0)
{
this.ShowMsg("现金券已经发送给用户，无法删除", true);
return;
}
if (VoucherHelper.DeleteVoucher(voucherId))
{
this.BindVouchers();
this.ShowMsg("成功删除了选定现金券", true);
return;
}
this.ShowMsg("删除现金券失败", false);
}