AjaxControlToolkit.AjaxFileUpload.OnLoad C# (CSharp) Method

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            // Register an empty OnSubmit statement so the ASP.NET WebForm_OnSubmit method will be automatically
            // created and our behavior will be able to disable input file controls prior to submission
            ScriptManager.RegisterOnSubmitStatement(this, typeof(AjaxFileUpload), "AjaxFileUploadOnSubmit", "null;");
        }