public override WebResponseContent DownLoadTemplate()
{
    this.IgnoreTemplateExecuting = (columns) =>
    {
        var list = new List<string>()
        {
            "qtyoh",
            "qtya",
            "qtyd",
            "qtyn",
            "qty5",
            "qtypu",
            "qtyt",
            "qtyso",
        };
        columns.AddRange(list);
        return columns;
    };
    return base.DownLoadTemplate();
}