AsyncFileUpload postback causes double upload

Question

I implemented the AsyncFileUpload control on a web page. This web page requires uploaded files to appear in a GridView.
The GridView

Answer 1

Maybe ugly, but works:

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1) Add a css-hidden asp:Button bellow the asp:AsyncFileUpload AsyncFileUpload1 control.

2) On the Page_Load method, remove the if (Request.Params.Get("__EVENTTARGET") == "UploadPostback") and put its block in a simple else to the previous if.

3) On the AsyncFileUpload1_UploadedComplete function, also remove the if (Request.Params.Get("__EVENTTARGET") != "UploadPostback") line, but leave intact everything that was inside it.

4) Back to the aspx. Put a asp:UpdatePanel outside the grid GridView1.

5) The last step is to change the AjaxUploadComplete client-side javascript function to make it trigger the postback. Replace it with the following:

function AjaxUploadComplete() {
    var btnClick = document.getElementById("btnClick");
    btnClick.click();
}

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Any file the user selects is uploaded only once.
All changes here are meant to be made in AjaxUpload.aspx & AjaxUpload.aspx.cs of your AjaxUpload.zip.