asp.net网格视图问题

Question

我在下面编写了用于排序网格视图列表的代码行

public void BindGrid()
{
    hdndata.Value = "no";
    EFDbContext dbContext = new EFDbContext();
    MainSetting Item = dbContext.FetchMainAppSettings();
    SearchHint = txtName.Text;
    CountryID = new Guid(ddlCountry.SelectedValue.ToString());
    City = txtCity.Text;
    State = ddlState.SelectedValue.ToString();
    City = txtCity.Text;
    Street = "";
    grdServiceList.Columns[2].HeaderText = Item.OrganisationCustomLabel+"/"+"Users";
    IEnumerable<_14Muslims.Domain.Entity.Service> Services = context.ServicesFetchWithPaging(ctlPager.PageIndex, ctlPager.PageSize, SearchHint, CountryID, Street, State, City);//.OrderBy(DataGridSortBy);
    grdServiceList.DataSource = Services;
    grdServiceList.DataBind();
    TotalRecords = 0;
    foreach (_14Muslims.Domain.Entity.Service c in Services)
    {
        hdndata.Value = "yes";
        TotalRecords = c.TotalPages;
        break;
    }
    ctlPager.UpdatePageLables(TotalRecords);
    ctlPager.Visible = TotalRecords > 0;
    Services = null;
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "getSelected", "HideProcessImage()", true);
}

protected void grdServiceList_Sorting(object source, GridViewSortEventArgs e)
{
    SortExpression = e.SortExpression;
    if (DataGridSortDirection == SortDirection.Ascending)
    {
        DataGridSortDirection = SortDirection.Descending;
        BindGrid();
        DataGridSortByDirection = "DESC";

    }
    else
    {
        DataGridSortDirection = SortDirection.Ascending;
        BindGrid();
        DataGridSortByDirection = "ASC";
    }
    DataGridSortBy = SortExpression;
}

  #region Sorting
public SortDirection DataGridSortDirection
{
    get
    {
        if (ViewState["sortDirection"] == null)
            ViewState["sortDirection"] = SortDirection.Ascending;

        return (SortDirection)ViewState["sortDirection"];
    }
    set { ViewState["sortDirection"] = value; }
}
public string DataGridSortBy
{
    get
    {
        if (ViewState["DataGridSortBy"] == null)
            ViewState["DataGridSortBy"] = "Description";

        return ViewState["DataGridSortBy"].ToString();
    }
    set { ViewState["DataGridSortBy"] = value; }
}
public string DataGridSortByDirection
{
    get
    {
        if (ViewState["DataGridSortByDirection"] == null)
            ViewState["DataGridSortByDirection"] = "ASC";

        return ViewState["DataGridSortByDirection"].ToString();
    }
    set { ViewState["DataGridSortByDirection"] = value; }
}
//protected void grdPostingList_Sorting(object source, GridViewSortEventArgs e)
//{
//    SortExpression = e.SortExpression;
//    if (DataGridSortDirection == SortDirection.Ascending)
//    {
//        DataGridSortDirection = SortDirection.Descending;
//    }
//    else
//    {
//        DataGridSortDirection = SortDirection.Ascending;
//    }
//    BindGrid();
//}
#endregion

现在的问题是它无法正常运行，也没有显示错误信息。

它没有对列表进行排序。