WebMethod: [System.Web.Services.WebMethod] Public Sub EditCart(ByVal PID As String, ByVal quantity As Integer) If Request.Cookies("CartCookie") Is Nothing = False Then Dim CartList As String = Request.Cookies("CartCookie").Value.ToString() Dim CartListSplitter As String() = CartList.Split("|"c) For Each items As String In CartListSplitter If Not items = "" Then Dim item As String() = items.Split(","c) If PID = item(0) Then item(1) += quantity // do something to update quantity and save to CartCookies Exit For End If End If Next Response.Redirect(Request.RawUrl, False) End If End Sub