Paging in Reapeter Asp.net C#

.aspx
-------------------------------------------------------

<div>
    <asp:Repeater ID="Repeater1" runat="server">
        <ItemTemplate>
            <div style="overflow: hidden;">
                <div style="float: left; margin: 1px; width: 70px; background: #EAEAFF; text-align:center;">
                    <%# Eval("ID") %>
                </div>
                <div style="float: left; margin: 1px; width: 150px; background: #EAEAFF; text-align:center;">
                    <%# Eval("Items") %>
                </div>
            </div>
        </ItemTemplate>
    </asp:Repeater>
    <div style="overflow: hidden;">
        <asp:Repeater ID="rptPages" runat="server"
            onitemcommand="rptPages_ItemCommand1">
            <ItemTemplate>
                <asp:LinkButton ID="btnPage"
                 style="padding:1px 3px; margin:1px; background:#ccc; border:solid 1px #666; font:8pt tahoma;"
                 CommandName="Page" CommandArgument="<%# Container.DataItem %>"
                 runat="server"><%# Container.DataItem %>
                </asp:LinkButton>
            </ItemTemplate>
        </asp:Repeater>
    </div>
</div>

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.cs
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protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LoadData();
    }
}
void LoadData()
{
    string constr = System.Web.Configuration.WebConfigurationManager.ConnectionStrings["conn"].ConnectionString;
    SqlDataAdapter da = new SqlDataAdapter("select * from rpt_items", constr);
    DataTable dt = new DataTable();
    da.Fill(dt);
    PagedDataSource pgitems = new PagedDataSource();
    System.Data.DataView dv = new System.Data.DataView(dt);
    pgitems.DataSource = dv;
    pgitems.AllowPaging = true;
    pgitems.PageSize = 5;
    pgitems.CurrentPageIndex = PageNumber;
    if (pgitems.PageCount > 1)
    {
        rptPages.Visible = true;
        System.Collections.ArrayList pages = new System.Collections.ArrayList();
        for (int i = 0; i < pgitems.PageCount; i++)
            pages.Add((i + 1).ToString());
        rptPages.DataSource = pages;
        rptPages.DataBind();
    }
    else
        rptPages.Visible = false;
    Repeater1.DataSource = pgitems;
    Repeater1.DataBind();
}
public int PageNumber
{
    get
    {
        if (ViewState["PageNumber"] != null)
            return Convert.ToInt32(ViewState["PageNumber"]);
        else
            return 0;
    }
    set
    {
        ViewState["PageNumber"] = value;
    }
}
protected void rptPages_ItemCommand1(object source, RepeaterCommandEventArgs e)
{
    PageNumber = Convert.ToInt32(e.CommandArgument) - 1;
    LoadData();
}