[SharePoint 2010 - Developpement] Publish and approve file programmatically sharepoint 2010

I created a module which deploy a file (itemStyle for a ContentQueryWepPart), and i wanted to publish and approve it directly programmatically.
In the feature of your module :

• Create an event Receiver
• Add this code :

   1: public override void FeatureActivated(SPFeatureReceiverProperties properties)

   2: {

   3:     publishItemStyle(properties);

   4: }

   5:  

   6: private void publishItemStyle(SPFeatureReceiverProperties properties)

   7: {

   8:     try

   9:     {

  10:         SPWeb web = (SPWeb)properties.Feature.Parent;

  11:         SPFile file = web.GetFile("Style Library/Xsl Style Sheets/ItemStyle.xsl");

  12:  

  13:         if (file.Level == SPFileLevel.Checkout)

  14:             file.CheckIn("", SPCheckinType.MajorCheckIn);

  15:         if (file.Level == SPFileLevel.Draft)

  16:         {

  17:             if (file.DocumentLibrary.EnableModeration) file.Approve("");

  18:             else file.Publish("");

  19:         }

  20:         file.Update();

  21:     }

  22:     catch (Exception e)

  23:     {

  24:     }

  25: }

Hope this help,