To enable sorting for gridview set allowsorting to true and add SortExpression=”colname” to all columns you want to sort and add the ff code.

 Protected Sub gridview1_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles gridview1.Sorting

        Dim mDS As DataSet

 

        mDS = 'function to fill the ds here

      [...]