ASP.NET GridViewのソート拡張コンポーネント
ASP.NET GridView Sort Indicator Component - The Code Project - ASP.NET
http://www.codeproject.com/useritems/GridViewSortIndicator.asp
ASP.NET GridView Sort Indicator Component - The Code Project - ASP.NET
http://www.codeproject.com/useritems/GridViewSortIndicator.asp