Create Paging in Repeater with Selected Page

public int PageNumber
    {
        get
        {
            if (ViewState["PageNumber"] != null)
                return Convert.ToInt32(ViewState["PageNumber"]);
            else
                return 0;
        }
        set
        {
            ViewState["PageNumber"] = value;
        }
    }
    public int PageIndex
    {
        get
        {
            return (ViewState["PageIndex"] == null ? 0 : Convert.ToInt32(ViewState["PageIndex"]));
        }
        set
        {
            ViewState["PageIndex"] = value;
        }

    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindRepeater();
        }
    }
    private void BindRepeater()
    {
        IshanDataset.OpeningPostRow[] list;
        IshanDataset.OpeningPostDataTable dt = OpeningPost.GetAllOpeningPosts();
        list = dt.OrderBy(p => p.SortOrder).ToArray();
       
        PagedDataSource pgitems = new PagedDataSource();
        pgitems.DataSource = list;
        pgitems.AllowPaging = true;
        pgitems.PageSize = 10;
        pgitems.CurrentPageIndex = PageNumber;
        if (pgitems.PageCount > 1)
        {
            rptPages.Visible = true;
            ArrayList pages = new ArrayList();
            for (int i = 0; i < pgitems.PageCount; i++)
                pages.Add((i + 1).ToString());
            rptPages.DataSource = pages;
            rptPages.DataBind();
        }
        else
            rptPages.Visible = false;
        repOpeningPosts.DataSource = pgitems;
        repOpeningPosts.DataBind();
    }
   
    protected void rptPages_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            int pageno = Convert.ToInt32(e.Item.DataItem);
            LinkButton lkbPage = e.Item.FindControl("btnPage") as LinkButton;
            lkbPage.PostBackUrl = Request.RawUrl;
            lkbPage.CommandArgument = pageno.ToString();
            lkbPage.Text = (pageno).ToString();
          
            if (PageIndex == pageno)
            {
                lkbPage.CssClass = "lnkselect";
            }
        }
    }
    protected void btnPage_Click(object sender, EventArgs e)
    {
        LinkButton lkbPage = sender as LinkButton;
        int pageno = Convert.ToInt32(lkbPage.CommandArgument);
        PageIndex = pageno;
        PageNumber = pageno - 1;
        BindRepeater();
    }


<asp:Repeater ID="repOpeningPosts" runat="server">
    <HeaderTemplate>
        <ul>
    </HeaderTemplate>
    <ItemTemplate>
        <li style="width: 100%; float: left; padding-top: 15px;">
            <div style="float: left;">
                <h5>
                    <a href="#" style="color: #4b4b4b; text-decoration: underline;">
                        <%# Eval("PostTitle")%></a>
                </h5>
            </div>
            <div style="float: right; width: 500px; padding-left: 15px; font-size: 11px; text-align: right;
                text-decoration: underline; font-weight: bold;">
                <i>
                    <%# DataBinder.Eval(Container.DataItem, "ClosingDate", "{0:dd MMMM yyyy}") %></i>
            </div>
            <div style="clear: both; padding-top: 10px;">
                <p style="color: #151515; font-size: 12px;">
                    <%# Common.Strip(Eval("Description").ToString()).ToString().Length > 150 ? Common.Strip(Eval("Description").ToString()).ToString().Substring(0, 150) + " ..." :
                                                                                                                                   Common.Strip(Eval("Description").ToString()).ToString()
                    %></p>
                <a href="#" style="float: right; color: #bd384d; font-size: 12px;">Read More...</a>
            </div>
        </li>
    </ItemTemplate>
    <FooterTemplate>
        </ul>
    </FooterTemplate>
</asp:Repeater>
<asp:Repeater ID="rptPages" runat="server" OnItemDataBound="rptPages_ItemDataBound">
    <HeaderTemplate>
        <div style="float: left;">
            <b>Page:</b>&nbsp;
        </div>
        <div style="float: left;">
    </HeaderTemplate>
    <ItemTemplate>
        <asp:LinkButton ID="btnPage" CommandName="Page" runat="server" OnClick="btnPage_Click" CssClass="lnkpaging">
        </asp:LinkButton>&nbsp;
    </ItemTemplate>
    <FooterTemplate>
        </div>
    </FooterTemplate>
</asp:Repeater>