I have a page with a partialview on it which is a list of items. I have a button on it which shows the next 5 items.

This is done via ajax:-

using (Ajax.BeginForm("ShowUpdates", new AjaxOptions() { UpdateTargetId = "statusUpdateContainer", InsertionMode = InsertionMode.InsertAfter }))
{
                <input type="submit" class="formbutton" value="Show More" style="width:100%;"/>
}

My partial view controller:

    [HttpPost]
    public ActionResult ShowUpdates(string page, string pagesize)
    {
        //get data code hidden here

        return PartialView("_statusUpdates");
    }

My question is that I need the 'page' variable to increment each time someone presses the form button which is contained within the partialview.

How do I keep track of that variable?