I have a AjaxFileUpload control in a usercontrol which is loaded dynamicaly on Postback, the problem here is, once the file is uploaded `IsPostBack` is false due to which the usercontrol is not loaded, causing the `OnUploadCompleteAll` event to not be triggered.

I found out that AjaxFileUpload control has its own postback property `AjaxFileUpload.IsInFileUploadPostBack`, how do i access this property from my main WebForm1.aspx page?

When an event is triggered from AjaxFileUpload i would like to check `IsInFileUploadPostBack` on page load of WebForm1.aspx and then load the usercontrol.

here is the code.

WebForm1.aspx

```
<form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:Button ID="Button1" runat="server" Text="Load Control" OnClick="Button1_Click" />
        <asp:PlaceHolder ID="Placeholder1" runat="server" />

    </form>

```

Codebehind

```
protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack)
                loadcontrol();
        }

        protected void Button1_Click(object sender, EventArgs e)
        {

        }

       private void loadcontrol()
        {
            this.Placeholder1.Controls.Clear();
            var _controls = LoadControl("~/WebUserControl1.ascx");
            this.Placeholder1.Controls.Add(_controls);
        }

```

WebUserControl1.ascx

```
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="AjaxFileUpload_Test.WebUserControl1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

<div id="div1">

        <ajaxToolkit:AjaxFileUpload ID="AjaxFileUpload1" UseAbsoluteHandlerPath="false" OnUploadCompleteAll="AjaxFileUpload1_UploadCompleteAll" OnUploadStart="AjaxFileUpload1_UploadStart" runat="server" />
</div>

```