Export all records of GridView to Excel with Custom SQL Stored Procedure Paging in ASP.Net

i want to export to excel on check box selection as you have done in "http://www.aspsnippets.com/Demos/414/"   but i have a custom pagging ,at one time i fetch only 10 records

      <asp:Button ID="btnExporttoExcel" runat="server" Text="Export to Excel" CssClass="btnLM"
                                        CausesValidation="False" OnClick="btnExporttoExcel_Click"  />

                 

  <asp:UpdatePanel ID="uppnlInprogress" runat="server">
                        <ContentTemplate>
                        <asp:GridView ID="grdInProgess" runat="server" AllowSorting="true" OnSorting="grdInProgess_Sorting"
                            AutoGenerateColumns="False" EmptyDataText="Record(s) Not Found." OnRowCommand="grdInProgess_RowCommand"
                            OnRowEditing="grdInProgess_RowEditing" OnRowCreated="grdView_RowCreated" OnRowDeleting="grdInProgess_RowDeleting"
                            OnRowDataBound="grdInProgess_RowDataBound">
                            <Columns>
                                <asp:TemplateField>
                                    <ItemTemplate>
                                        <asp:CheckBox ID="chkStatus" runat="server" onclick = "Check_Click(this)"   />
                                        <asp:HiddenField ID="hdnFldId" runat="server" Value='<%# Eval("ID") %>' />
                                        <asp:ImageButton ID="ImgBtncommand" runat="server" CausesValidation="false" Visible="false"
                                            CommandArgument='<%# Bind("ID") %>'  />
                                        <asp:Label ID="lblStatus" runat="server" Visible="false" Text='<%# Bind("ID") %>'></asp:Label>
                                    </ItemTemplate>
                                    <HeaderTemplate>
                                        <asp:CheckBox ID="chkHeader" runat="server" onclick = "checkAll(this)" />
                                    </HeaderTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="">
                                    <ItemTemplate>
                                        <asp:ImageButton ID="imgEdit" ToolTip="Click to Edit" runat="server" ImageUrl="~/App_Themes/Spring Orange Trebuchet/images/ico-edit.gif"
                                            CausesValidation="false" CommandArgument='<%# Bind("ID") %>' CommandName="Edit" />
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="">
                                    <ItemTemplate>
                                        <asp:ImageButton ID="imgDelete" ToolTip="Click to Delete" runat="server" ImageUrl="../App_Themes/Spring Orange Trebuchet/Images/delete.gif"
                                            CausesValidation="false" CommandArgument='<%# Eval("ID") + ";" + Eval("UserType") %>'
                                            CommandName="Delete" />
                                        <%-- <ajax:ConfirmButtonExtender ID="cbeDelAppl" runat="server" TargetControlID="imgDelete"
                                            ConfirmText="Are you sure you want to delete  Committee Member?">
                                        </ajax:ConfirmButtonExtender>--%>
                                    </ItemTemplate>
                                    <ItemStyle HorizontalAlign="Center" />
                                </asp:TemplateField>
                                <asp:BoundField DataField="SSOID" HeaderText="Net ID">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                </asp:BoundField>
                                <asp:BoundField DataField="LastName" SortExpression="LastName" HeaderText="Last Name">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                                <asp:BoundField DataField="FirstName" SortExpression="FirstName" HeaderText="First Name">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                                <asp:BoundField DataField="EmailId" SortExpression="EmailId" HeaderText="Email">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                                <asp:BoundField DataField="SSOID" SortExpression="SSOID" HeaderText="SSO-ID" Visible="false">
                                    <ItemStyle HorizontalAlign="Left" />
                                </asp:BoundField>
                                <asp:BoundField DataField="Phone" HeaderText="Phone">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="false" />
                                </asp:BoundField>
                                <asp:BoundField DataField="UserType" SortExpression="UserType" HeaderText="Role">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                                <asp:BoundField DataField="YaleNonYale" SortExpression="YaleNonYale" HeaderText="Type">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                                <asp:BoundField DataField="IsActive" SortExpression="IsActive" HeaderText="Status">
                                    <ItemStyle HorizontalAlign="Left" Wrap="True" />
                                    <HeaderStyle Font-Underline="true" />
                                </asp:BoundField>
                            </Columns>
                        </asp:GridView>
                        <asp:HiddenField ID="hdnFldSelectedValues" runat="server"  />
                        <br />
                        <uc2:Pager ID="ccPagerControl"  OnPageChanged="ccPagerControl_PageChanged" runat="server" />
                        </ContentTemplate>
                        <Triggers>
                        <asp:PostBackTrigger ControlID="btnExporttoExcel" />
                      </Triggers>
                        </asp:UpdatePanel>

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 private void LoadGrid(int PageNumber, String AdvanceQuery)
        {



            SearchString = AdvanceQuery;
            DataSet dsCommitteMembers = new DataSet();
            new ManageCommitteeMembersBL(0).FetchAllPaging(dsCommitteMembers, PageNumber, ccPagerControl.CurrentPageSize, (SortExpression == string.Empty ? "LastName" : SortExpression), (GridViewSortDirection == SortDirection.Ascending ? "ASC" : "DESC"), SearchString);
            try
            {
                if (dsCommitteMembers.Tables[0].Rows.Count > 0)
                {

                    ccPagerControl.Visible = true;

                    int TotalRecords = WebUtility.Cast(dsCommitteMembers.Tables[1].Rows[0][0].ToString(), 0);
                    int PageSize = ccPagerControl.CurrentPageSize;

                    if (PageSize == 0) /* To Avoid Division Of Zero */
                        ccPagerControl.TotalPages = 1;
                    else
                        ccPagerControl.TotalPages = TotalRecords % PageSize == 0 ? TotalRecords / PageSize : TotalRecords / PageSize + 1;

                    if (PageNumber == 0)
                        ccPagerControl.CurrentPageNumber = 1;

                    ccPagerControl.ShowingPagingVariables();

                    grdInProgess.DataSource = dsCommitteMembers.Tables[0];
                    grdInProgess.PageIndex = PageNumber < 0 ? 0 : PageNumber;
                    grdInProgess.DataBind();
                    btnExporttoExcel.Enabled = true;

                }
                else
                {
                    btnExporttoExcel.Enabled = false;
                    grdInProgess.DataSource = dsCommitteMembers.Tables[0];
                    grdInProgess.DataBind();
                    ccPagerControl.Visible = false;
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
                dsCommitteMembers = null;
            }
        }



 protected void ccPagerControl_PageChanged(object sender, CustomControls.Pager.CustomPageChangeArgs e)
        {

            //string Idpagers = string.Empty;
            //Idpagers = WebUtility.getcommand(Idpagers, grdInProgess, "chkStatus", "ImgBtncommand");


            //hdnFldSelectedValues.Value = hdnFldSelectedValues.Value + Idpagers;


            LoadGrid(e.CurrentPageNumber - 1, SearchString);
 
          
        }