GRIDVIEW排序的方法

如果是在前台写数据源的话，例如：
<asp:ObjectDataSource ID="objDataSourceSgridView" runat="server"   TypeName=" 。。。"
    SelectMethod="GetMethodAll">
</asp:ObjectDataSource>
就可以这样写：
  protected void sgvw_Sorting(object sender, GridViewSortEventArgs e)
    {
        DataTable sortDataTable = sgvw.DataSource as DataTable;
        if (sortDataTable != null)
        {
            DataView sortDataView = new DataView(sortDataTable);
            sortDataView.Sort = e.SortExpression + "" + ConvertSortDirection(e.SortDirection);
            sgvw.DataSource=sortDataView;
            sgvw.DataBind();
        }

    }
//改变排序方向
    private string ConvertSortDirection(SortDirection Direction)
    {
        string a_SortDirection = string.Empty;
        switch (Direction)
        {
            case SortDirection.Ascending:
                a_SortDirection = "ASC";
                break;
            case SortDirection.Descending:
                a_SortDirection = "DESC";
                break;
        }
        return a_SortDirection;
    }

但是如果在后台绑定数据源的话，这个事件就不能触发，怎么办呢？可以用另一个事件：

 protected void sgvw_NoSourceControlSorting(object sender, Suzsoft.Web.UI.EventArg.SGridViewSortEventArgs e)
    {
        DataSet ds = new DataSet();
        DataSet dsNew = new DataSet();

        ds = (DataSet)ViewState["ds"];
        if (ds != null)
        {
            dsNew = PermissionControl.DataSetFilter(base.Login_UserID, " ", ds);//信息过滤
        }
        if (dsNew != null && dsNew.Tables.Count > 0)
        {
            e.DataSource = dsNew.Tables[0];
        }
    }