CustomTable Global event handler

I have implemented event handler for our bizforms , they all work perfectly well but I am still having issue with the custom tables see my code below and advise.Are the implementation for custom tables different from bizforms? It is suppose to update our CRM system.

[assembly: RegisterModule(typeof(CustTableventsModule))] namespace custTable { public class CustTableventsModule : CMS.DataEngine.Module { public CustTableventsModule() : base("CustTablevents") { }

    // Contains initialization code that is executed when the application starts
    protected override void OnInit()
    {
        base.OnInit();

        // Assigns custom handlers to events
        CustomTableItemEvents.Insert.After += CustomTable_Insert_After;
    }

    private void CustomTable_Insert_After(object sender, CustomTableItemEventArgs e)
    {
        CustomTableItem item = e.Item;
        if (item != null && item.CustomTableClassName.ToLower() == "customtable.producttype")
        {

            //string itemTextValue = item.GetStringValue("ProductName","");
            string itemTextValue = ValidationHelper.GetString(item.GetValue("ProductName"), "");

            string documentUrl = DocumentContext.CurrentDocument.NodeAliasPath.Replace("/", "-");
            CRM.customtable(itemTextValue, documentUrl);

        }
    }
}

}