Gridview inside Update panel PageIndex not maintained on button click

Question

I have a gridview inside update panel and a button on whose click gridview is binded.

<asp:UpdatePanel runat="server" ID="upPanelPrjSumm" UpdateMode="Conditional">
   <ContentTemplate>
        <asp:GridView ID="gvProjectionSummary" runat="server"           
         AutoGenerateColumns="true"  AllowPaging="true" PageSize="18" 
         OnPageIndexChanging="gvProjectionSummary_PageIndexChanging"
         OnRowDataBound="gvProjectionSummary_RowDataBound" PagerSettings-     
         Mode="Numeric" >
        </asp:GridView>

 <asp:Button runat="server" ID="btnChange" OnClick="btnChange_Click"  
  Text="Change" />
</ContentTemplate>
  <Triggers>
  </Triggers>
</asp:UpdatePanel>

When I click on Change button , gridview is rebinded but page index number is reset to 1 irrespective of on which page I was when button was clicked.

1 2 3 4

How to maintain page number while using this Update panel control.

Answer 1

You can put the page number in ViewState and update it just before you rebind it. just before rebinding the GridView assign the page number from the ViewState