BuildingCoder.CmdWallFooting.Execute C# (CSharp) Method

        public Result Execute(
            ExternalCommandData commandData,
            ref string message,
            ElementSet elements)
        {
            UIApplication app = commandData.Application;
              UIDocument uidoc = app.ActiveUIDocument;
              Document doc = uidoc.Document;

              Wall wall = Util.SelectSingleElementOfType(
            uidoc, typeof( Wall ), "a wall", false )
              as Wall;

              if ( null == wall )
              {
            message
              = "Please select a single wall element.";

            return Result.Failed;
              }

              ICollection<ElementId> delIds = null;

              using( Transaction t = new Transaction( doc ) )
              {
            try
            {
              t.Start( "Temporary Wall Deletion" );

              delIds = doc.Delete( wall.Id );

              t.RollBack();
            }
            catch ( Exception ex )
            {
              message = "Deletion failed: " + ex.Message;
              t.RollBack();
            }
              }

              WallFoundation footing = null;

              foreach ( ElementId id in delIds )
              {
            footing = doc.GetElement( id ) as WallFoundation;

            if( null != footing )
            {
              break;
            }
              }

              string s = Util.ElementDescription( wall );

              Util.InfoMsg( ( null == footing )
            ? string.Format( "No footing found for {0}.", s )
            : string.Format( "{0} has {1}.", s,
              Util.ElementDescription( footing ) ) );

              return Result.Succeeded;
        }