Hi,

You need to add the Log4Net Assembly as a reference to your project and then use the following as an example.

using log4net;

namespace MyProject.Web
{
   public partial class MyCustomControl : SiteModuleControl
   {
      private static readonly ILog log = LogManager.GetLogger(typeof(MyCustomControl));
   }

   protected void Page_Load(object sender, EventArgs e)
   {
      try 
      {
         //try to do something here
      }
      catch (Exception ex) //try to be more specific with the exception type
      {
         log.Error("could not do something. Error was: " + ex);
      }
   }
}

That should get you started with logging in mojoPortal.

HTH,
Joe D.