Gridview paging always display second page only

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Gridview

Hi,

I have one problem in the Gridview.

I have given Allowpaging is "True".

But, when i load the page it is always showing the second page only.

what is the problem...?

ASPX Page
---------

<asp:GridView ID="GridView1" runat="server" align="center" AllowPaging="true"  
                                 AutoGenerateColumns="False" class="tab1" DataSourceID="SqlDataSource1" 
                                 HorizontalAlign="Center" Width="100%">

ASPX.VB Page
--------------

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
       Dim sno As New Label
       Dim SrNo As Integer
       If e.Row.RowType = DataControlRowType.DataRow Then
           SrNo = (GridView1.PageIndex + 1) * 10 - 9
           sno = e.Row.FindControl("Sno")
           sno.Text = e.Row.RowIndex + SrNo
           sno.DataBind()
       End If
       'for Edit the PR Details to pass the PRNo and RevisionNo in the URL
       Dim Hyper1 As New HyperLink
       If e.Row.RowType = DataControlRowType.DataRow Then
           Hyper1 = e.Row.FindControl("hyperlink1")
           Dim PNo1 As Integer = e.Row.Cells(1).Text
           Dim RevNo1 As Integer = e.Row.Cells(3).Text
           Hyper1.NavigateUrl = "PR.aspx?PNo=" & e.Row.Cells(1).Text & "&RevNo=" & e.Row.Cells(3).Text & "&page=" & GridView1.PageIndex + 1
           Hyper1.DataBind()
       End If
   End Sub