this.hidden = true;

because that will result in:

System.InvalidOperationException: The Visible property cannot be set on Web Part XXXXXXX

Instead, I will do the following:

SPFile myPage= SPContext.Current.File;
SPLimitedWebPartManager limitedWebPartManager;


   //Get the page's limited webpart manager
   using (limitedWebPartManager = myPage.GetLimitedWebPartManager(PersonalizationScope.Shared))
   {
      System.Collections.Generic.List configuratorWebParts = limitedWebPartManager.WebParts.Cast().Where(webpart => webpart.Title == "TITLE OF MY WEBPART").ToList();

     if (configuratorWebParts.Count > 0)
     {
       foreach (System.Web.UI.WebControls.WebParts.WebPart webPart in configuratorWebParts)
       {
           webPart.Hidden = true;
           limitedWebPartManager.SaveChanges(webPart);
       }

      }
    }

and voila!

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