How to show updateProgess with postback trigger on button inside grideview

I am trying to create files on server on button click and same time i am downloading those files on client machine while the process is sucessfull but while the process is going on I am not able to show updateProgess or loader on the screen. I have kept the updatePanel with updateProgess on master page and in the content page there's a gridview with a linkbutton in the header which generates files and download it. The only problem i am facing is i am not to show progess bar is there any way i could do it.

This is my master page:

<div class="container-fluid" id="body"><asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate><asp:ContentPlaceHolder ID="BodyContentPlaceHolder" runat="server"></asp:ContentPlaceHolder></ContentTemplate><Triggers><asp:AsyncPostBackTrigger ControlID="menuBar" /><asp:AsyncPostBackTrigger ControlID="MenuCategories" /></Triggers></asp:UpdatePanel><asp:UpdateProgress ID="progress" runat="server" DynamicLayout="true" DisplayAfter="0"><ProgressTemplate><div class="ui-widget-overlay"><div id="dvLoading"></div></div></ProgressTemplate></asp:UpdateProgress></div>

And this is my content page:

<div><cc1:TabContainer ID="TabContainer3" runat="server" ActiveTabIndex="0" AutoPostBack="true" CssClass="AspTabContainer"><cc1:TabPanel ID="TabPanel6" runat="server" HeaderText="Transaction"><ContentTemplate><div id="Div1" runat="server" style="width:2000px"><asp:GridView ID="GridView1" runat="server"
                        AutoGenerateColumns="False"
                        AllowSorting="False" AllowPaging="false" PageSize="7"
                        CssClass="table table-responsive table-bordered table-hover AspGridview"><PagerStyle CssClass="pagination" /><Columns><asp:TemplateField HeaderText="Select Code"><HeaderTemplate><asp:CheckBox ID="SelectAllCode" runat="server" OnCheckedChanged="SelectAllCode_CheckedChanged" AutoPostBack="true" /></HeaderTemplate><ItemTemplate><asp:CheckBox ID="SelectCode" runat="server" OnCheckedChanged="SelectCode_CheckedChanged" AutoPostBack="true" /></ItemTemplate></asp:TemplateField><asp:TemplateField HeaderText="Actions"><ItemTemplate><asp:LinkButton ID="LnkViewButton" runat="server" Font-Underline="true" Enabled="false" OnClick="LnkViewButton_Click" CssClass="editbutton">View</asp:LinkButton></ItemTemplate></asp:TemplateField><asp:TemplateField HeaderText="Actions" HeaderStyle-Width="120px"><HeaderTemplate><asp:LinkButton ID="LnkGenerateAllButton" BackColor="#ffffff" ForeColor="#000000" runat="server" Font-Underline="true"
                                        Enabled="false" OnClick="LnkGenerateAllButton_Click" CssClass="editbutton">Generate All</asp:LinkButton></HeaderTemplate><ItemTemplate><asp:LinkButton ID="LnkGenerateButton" runat="server" Font-Underline="true" Enabled="false"
                                        OnClick="LnkGenerateButton_Click" CssClass="editbutton">Generate</asp:LinkButton></ItemTemplate></asp:TemplateField><asp:BoundField DataField="CHARGE_CODE" SortExpression="CHARGE_CODE" HeaderText="Charge Code"></asp:BoundField><asp:BoundField DataField="PRO_CLIENT_FLAG" SortExpression="PRO_CLIENT_FLAG" HeaderText="Pro Client Flag"></asp:BoundField><asp:BoundField DataField="CHARGE_NAME" SortExpression="CHARGE_NAME" HeaderText="Charge Name"></asp:BoundField><asp:BoundField DataField="DEPT_NAME" SortExpression="Dept_NAME" HeaderText="Department Name"></asp:BoundField><asp:BoundField DataField="PROCESSED_BY" SortExpression="PROCESSED_BY" HeaderText="Processed By"></asp:BoundField><asp:BoundField DataField="PROCESSED_DATE" SortExpression="PROCESSED_DATE" HeaderText="Processed Date"></asp:BoundField></Columns><HeaderStyle BackColor="#0089d0" ForeColor="White" HorizontalAlign="Left" /><PagerStyle BackColor="#0089d0" Font-Bold="true" ForeColor="White" /><EmptyDataTemplate>No Record Found</EmptyDataTemplate><EditRowStyle BackColor="#c0e6fa" /></asp:GridView></div></ContentTemplate></cc1:TabPanel></cc1:TabContainer></div>

Code behind (Content Page):

LinkButton lnkheader = (LinkButton)GrdChargeCodeProcessing.HeaderRow.FindControl("LnkGenerateAllButton");
ScriptManager.GetCurrent(this).RegisterPostBackControl(lnkheader);

Thankyou for your help.