gridview paging without postback

Question

I have gridview with data ,imagebutton(view,edit and delete). how to applying paging to gridview without postback. I tried with update panel,it worked for paging but event associated with imagebutton were not working. Exactly speaking, image button events are working , but not  showing any effect.

<asp:GridView ID="gvSalesSubCategory" runat="server" AutoGenerateColumns="false" 

                HeaderStyle-BackColor="#E5E5E5" AlternatingRowStyle-BackColor="#F3F3F3"

                CellPadding="1" Style="" HeaderStyle-Height="2px" AlternatingRowStyle-Height="10px"

                DataKeyNames="SalesBySubCategoryID" 

                onpageindexchanging="gvSalesSubCategory_PageIndexChanging" 

                onrowcommand="gvSalesSubCategory_RowCommand" 

                onrowdeleting="gvSalesSubCategory_RowDeleting" 

                onrowediting="gvSalesSubCategory_RowEditing" PageSize="5" AllowPaging="True" 

                    onrowcreated="gvSalesSubCategory_RowCreated" Width="700px" >

                <Columns >

                    <asp:BoundField DataField="SLNO" HeaderText="SLNO" ItemStyle-HorizontalAlign="Center"  />

                    <asp:BoundField DataField="BranchName" HeaderText="Branch Name" ItemStyle-HorizontalAlign="Center" />

                    <asp:BoundField DataField="MainCategoryName" HeaderText="Main Category" ItemStyle-HorizontalAlign="Center" />

                    <asp:BoundField DataField="SalesDate" HeaderText="Sales Date"  ItemStyle-HorizontalAlign="Center"/>

                     

                    <asp:TemplateField ItemStyle-HorizontalAlign="Center" >

                        <ItemTemplate>

                            <asp:ImageButton ID="ibtnView" runat="server" ImageUrl="~/images/hammer_screwdriver.png"

                                ToolTip="View" CommandName="View" CommandArgument='<%#((GridViewRow)Container).RowIndex %>'

                                CausesValidation="false" />

                            <asp:ImageButton ID="ibtnEdit" runat="server" ImageUrl="~/images/pencil.png" ToolTip="Edit"

                                CommandName="Edit" CommandArgument='<%#((GridViewRow)Container).RowIndex %>'

                                CausesValidation="false" />

                            <asp:ImageButton ID="ibtnDelete" runat="server" ImageUrl="~/images/cross.png" ToolTip="Delete"

                                CommandName="Delete" CommandArgument='<%#((GridViewRow)Container).RowIndex %>'

                                CausesValidation="false" OnClientClick="return confirm('Are you Sure to Delete?');" />

                        </ItemTemplate>

                    </asp:TemplateField>

                </Columns>

                

            </asp:GridView>

Respond , if you have a answer.

Thanks