如何使用PagedDataSource获取当前页面

我正在使用Umbraco CMS，并试图制作下一个和上一个按钮来滚动页面/节点的集合。我已经设法使页面总数正确，但CurrentPageIndex总是显示为0，我如何获得页面在由我的PagedDataSource创建的列表中的CurrentPageIndex，并递增/递减以移动到下一页？

到目前为止，我得到的代码是：

Asp.Net:

<div class="detail-paging">
<div class="list-paging-control">
    <p><asp:HyperLink runat="server" id="lnkFirstPage">&lt;&lt;</asp:HyperLink></p>
    <p><asp:HyperLink runat="server" id="lnkPrev" OnServerClick="lnkPrev_Click">&lt;</asp:HyperLink></p>
</div>
<div class="list-paging-numbers">
    <p><asp:Label runat="server" ID="lblCurrentScroll"></asp:Label></p>
</div>
<div class="list-paging-control left-marker">
    <p><asp:HyperLink runat="server" id="lnkNext" OnServerClick="lnkNext_Click">&gt;</asp:HyperLink></p>
    <p><asp:HyperLink runat="server" id="lnkLastPage">&gt;&gt;</asp:HyperLink></p>
</div>
<div class="list-paging-text">
    <p><asp:HyperLink runat="server" ID="lnkViewAll" OnClick="ViewAll_Click">View All</asp:HyperLink></p>
</div>

C#：

    private PagedDataSource paging;
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DoDataBind();
    }
}
public int PageNumber
{
    get
    {
        if (ViewState["PageNumber"] != null)
            return Convert.ToInt32(ViewState["PageNumber"]);
        else
            return 0;
    }
    set
    {
        ViewState["PageNumber"] = value;
    }
}
//ALL CODE THAT BINDS DATA FROM UMBRACO
public void DoDataBind()
{
    //Get the parent node.
    Node parent = new Node(1152);
    //Get all the BrandsDetailPage children and order alphabetically.
    IEnumerable<INode> nodes = HelperMethods.GetChildrenOfType(parent, "BrandsDetailPage", true, true).OrderBy(n => n.Name);
    //Pagination
    paging = new PagedDataSource()
    {
        AllowPaging = true,
        DataSource = nodes.ToList(),
        CurrentPageIndex = PageNumber,
        PageSize = 1
    };
    //pageNumber = paging.CurrentPageIndex;
    CreateNavigation();
}
//ALL CODE THAT BINDS DATA FROM UMBRACO
//PAGINATION
public void CreateNavigation()
{
    lblCurrentScroll.Text = PageNumber.ToString();
    lblCurrentScroll.Text += " of ";
    lblCurrentScroll.Text += paging.PageCount;
Node node = new Node(1153);
    string nodeUrl = node.Url;
    lnkViewAll.NavigateUrl = string.Format("{0}?page=All", nodeUrl);
}
protected void lnkPrev_Click(object sender, EventArgs e)
{
    PageNumber--;
    DoDataBind();
}
protected void lnkNext_Click(object sender, EventArgs e)
{
    PageNumber++;
    DoDataBind();
}