Gridview paging error

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ASP.NET

Hello again programmers. I still dont get it in regards to paging. As you see I am binding pictures, hyperlinks ets to gridview and so far it works(In gridview itself). My problem is that i set may paging to true but it doesnt use it function. I doesnt have error so i dont know what the problem is plss help
My code on client side

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Buy.aspx.vb" Inherits="Buy" title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<br>
     <div style="overflow: auto; width: 776px; height: 712px">
        <asp:GridView ID="GridView1" runat="server" Width="766px" AutoGenerateColumns="False" AllowPaging="true" Height="708px" PageIndex="10"  OnPageIndexChanging = "GridView1_OnPageIndexChanging" >
    <columns>
              <asp:BoundField DataField="imageID" HeaderText="imageID"
              InsertVisible="False" ReadOnly="True"                               
              SortExpression="imageID" />
           
               <asp:HyperLinkField 
            DataTextField="ImageTitle" 
                    HeaderText="Title" 
                    SortExpression="ImageTitle" 
                    DataNavigateUrlFields="ImageTitle" 
                    DataNavigateUrlFormatString="ProductDetails.aspx?ProductID={0}" />

               
              <asp:TemplateField HeaderText="Image">
              <itemtemplate>
              <asp:Image ID="Image1" runat="server" Width ="75px" Height= "75px"          
              ImageUrl='<%# Eval("imageID", "ImageHandler.ashx?imageID={0}")%>'/>
              </itemtemplate>
              
              
              
              </columns>
              
    
    </div>

</br>

My code on Server Side

Imports System.Data
Imports System.Data.SqlClient
Partial Class Buy
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If (Not IsPostBack) Then
            GridView1.PageIndex = 10
            bind()
        End If

    End Sub
    Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, _
        ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridView1.PageIndexChanging
        GridView1.PageIndex = e.NewPageIndex
        bind()
    End Sub

    Private Function getTable() As DataTable
        Dim conn As New SqlConnection("Data Source=ML0003135586\SQLEXPRESS;Initial Catalog=ecom;Integrated Security=True")
        Dim adap As New SqlDataAdapter("SELECT Image,ImageTitle,imageID from [tblSelling] ORDER BY [imageID] DESC", conn)
        Dim dt As New DataTable()
        adap.Fill(dt)
        Return dt
    End Function
    Private Sub bind()
        Dim dr As DataTable = getTable()
        GridView1.DataSource = dr
        GridView1.DataBind()
    End Sub
End Class

My paging does not work. Pls help.

thanks in advance and more power sirs