auto refresh dropdownlist from a iframe without postback

[jfrangamo]

i have a procedure to fill the dropdownlist ddlogo from the server, them i have a iframe with a page to upload a file and when click in button to load the image i want to refresh the dropdownlist but this dropdownlist is in another panel and not want to reload the page


Dropdownlist in Admin.aspx

<asp:DropDownList ID="ddLogos" DataTextField="FileDescription" DataValueField="FilePath" runat="server" Width="300"></asp:DropDownList></td>

procedure to fill dropdownlist in server

DataTable dtLogos = Kicktag.GetDataTableFromProc("POR.usp_GetFiles", Params, User.Identity.Name, "Analytics", 2, "DEV");
        ddLogos.DataSource = dtLogos;
        ddLogos.DataBind();
        ddLogos.Items.Insert(0, new ListItem("--Select Logo--", "0"));

        String LogoPath = dtProjectInfo.Rows[0]["ProjectLogoPath"].ToString();
        if (LogoPath != "")
        {
            ddLogos.SelectedIndex = ddLogos.Items.IndexOf(ddLogos.Items.FindByValue(LogoPath));
        }

when i click in this button, that is in Upload.aspx

i want to call procedure to fill dropdownlist in Admin.aspx

<asp:Button ID="btnUpload" OnClick="btnUpl oadLogo_Click" runat="server" Text="Upload" />


Notice: Dropdownlist is in Admin.aspx and button to upload is in Uploadlogo.aspx and this two fomrs in in a masterpage whit UpdatePanels, to show Uploadlogo i have a iframe