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How to handle page refresh in ASP.NET

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Last Modified: 2013-11-08
I have a ImageButton(submit) and a FileUpload controls on my ASP.NET page.
When the user upload a file and clicks the Image button it gets into the Submit_File button click which is tied to the ImageButton click event.

When the user refreshes the page it also gets into the submit click event which I want to prevent.

How can I do this

I tied the following in the code behind, and this prevents the refresh, but prevents a new file being processed, bcos after the first submit and any subsequent refreshes the Session["Submitted"] = true
if (!Page.IsPostBack)
        {
if (Session["Submitted"] == null)
                Session.Add("Submitted", false);
            else
                Session["Submitted"] = false;
}

submit_click event(object sender, eventargs e)
{
 if ((Session["Submitted"] == null) || (Convert.ToBoolean(Session["Submitted"]) == false))
        {
                    }
        else { return; }

processData()
 Session.Add("Submitted", true);
}

I also tried adding a second hidden button with a click event but it always gets into the Submit_file click
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