正如您所提到的，它为您的gridview提供了一种过滤器，请仔细阅读以下文章，其中介绍了gridview过滤器的创建:
Asp.Net_GridView_Filter [ Excel-like-AutoFilter-Feature-in-ASP. Net-GridView-Control [ Asp.Net_GridView_Filter_Sample [

As you have mentioned that its kind of filter for your gridview, please go through following article which illustrates the creation of gridview filter:
Asp.Net_GridView_Filter[^]
Excel-like-AutoFilter-Feature-in-ASP.Net-GridView-Control[^]

Working Sample:
Asp.Net_GridView_Filter_Sample[^]