OPening a PDF in a control in a web application

Hi,
I would like to open a pdf in a control in a form.

I have a list page, when I click on a record, it opens a new page. This new page is divided in 2.
On the left I need to open a PDF and on the right, I'll display some information, see attach image.

I would like to open this pdf document in the Page_Load of the control called ctlDisplayPDF in the page.
following is the code and the page:

I know how to open a file in a window, using ScriptManager.RegisterStartupScript, but I haven't managed to open it in a control in a page.

Thank you in advance for your help

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MarkingPaper.aspx.cs" Inherits="Sapphire.MarkingPaper" MasterPageFile="~/Master/Extra_MasterPage.master"%>

<%@ Register Src="~/Control/Marking/Application/Applicant/sks_PaperApplication.ascx" TagName="Paper_Application" TagPrefix="sks" %>
<%@ Register Src="~/Control/Marking/Application/Applicant/sks_DisplayPDF.ascx" TagName="DisplayPDF" TagPrefix="sks" %>


    <%@ Register Src="~/Control/Menu/sks_MiniMenu.ascx" TagName="PopoutMenu" TagPrefix="sks" %>


<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

        <asp:Panel ID="pnlParameter" runat="server" Visible="false">
        <asp:Label ID="lblFormTitle" runat="server"/>
    </asp:Panel>

    <sks:PopoutMenu ID="ctlPopOutMenu" runat="server" OnPreview="ctlPopOutMenu_GoTo"  
    ShowPrevious="true" ShowPreview="False" ShowHome="true"  ShowSave="false"
    OnGoTo="ctlPopOutMenu_GoTo" OnSave="ctlPopOutMenu_Save"/>

    <tlk:RadDockLayout runat="server" ID="RadDockLayout1">
        <table style="width:1290px">
            <tr>
                <td style="vertical-align: top; padding-left:15px;width:45%">
                    <tlk:RadDockZone ID="RadDockZone2" runat="server" Orientation="Vertical" Width="100%" CssClass="StyledZoneDock">
                        <tlk:RadDock ID="RadDock1" runat="server" Title="Assessment information" Width="100%" EnableAnimation="true" DefaultCommands="ExpandCollapse" BorderWidth="2px" BorderColor="White"
                         Resizable="true" CssClass="StyledDock" >
                            <ContentTemplate>
                                <asp:Label ID="TestMe" runat="Server" />
                                <sks:DisplayPDF ID="ctlDisplayPDF" runat="server" Name="Answer" />
                            </ContentTemplate>
                        </tlk:RadDock>
                    </tlk:RadDockZone>
                    
                </td>
                <td style="vertical-align: top; padding-left:10px;padding-right:15px;width:35%">
                    <tlk:RadDockZone ID="RadDockZone1" runat="server" Orientation="Vertical" Width="100%" Skin="" CssClass="StyledZoneDock">
                        <tlk:RadDock ID="RadDock4" runat="server" Title="Assessment Paper" Width="100%" EnableAnimation="true" DefaultCommands="ExpandCollapse" BorderWidth="2px" BorderColor="White"
                         Resizable="true" CssClass="StyledDock">
                            <ContentTemplate>
                                <sks:Paper_Application ID="ctlPaperApplication" runat="server" Name="Answer" />
                            </ContentTemplate>
                        </tlk:RadDock>
                    </tlk:RadDockZone>
                    </td>
            </tr>
        </table>
        <br />
    </tlk:RadDockLayout>
<%--</div>--%>

        <asp:Panel ID="pnlSubmit" runat="server" Width="99%" Visible="true">
        <hrz:Submit ID="ctlSubmit" runat="Server" SubmitBackColour="#FFCD00" 
            showSubmit="False" ShowPrevious="true" ShowSave="false" 
            OnGoToNext="ctlSubmit_GoTo"  OnGoToPrevious="ctlSubmit_GoTo" OnSave="ctl_Save" OnDisplayHelp="btnHelp_File"/>
    </asp:Panel>
</asp:Content>

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Add-pdf.png