How to add a new field each time a button is clicked

I want to create a new fileupload field each time i click on a button. i have a form in a page and i want to add the fields to that form. i tried to save an array of fileupload fields in a session but it deosnt seem to work.

protected void Page_Load(object sender, EventArgs e)
    if (!this.IsPostBack)
        this.Session["fileUploadArray"] = new FileUpload[5];

protected void Button1_Click(object sender, EventArgs e)
    FileUpload[] flArray = ((FileUpload[])(this.Session["fileUploadArray"]));
    for (int i = 0; i < flArray.Length; i++)
        if (flArray[i] == null)
            flArray[i] = new FileUpload();
            this.Session["fileUploadArray"] = flArray;


Dynamically controls must be added in Page_Init event, refer to answer of mine on following post:

Dynamically generated buttons, on click not being executed

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