move objects from right-left

Question

Hi everybody,

I have this:

[code]

 private bool MoveInvaders()
      {
          bool directionChanged = false;
         
              //if ((TimerCounter % TheSpeed) == 0)
              //{                
          //foreach (Invader invader in invaders)
         // {
           //   invader.Move(Direction.Right);
          //}
          if (direction == Direction.Right)
          {
              //invader.Move( Direction.Right);                                

              var invaderGroups = from invader in invaders
                                  where invader.Location.X > boundaries.Right - 800
                                  orderby invader.Location.Y descending
                                  group invader by invader.Location.X into invaderGroup
                                  //select invaderGroup;
                                  select invader;

              //theInvader.Move(Direction.Left);                
              //where                
              //select invaderGroup;
        
              if (invaderGroups.Count() > 0) directionChanged = true;

          }
          //End if
          else
          // if (direction == Direction.Left)
          {
              int pixxel = boundaries.Width - GameConstants.InvaderEdgeOfScreen;
              var invaderGroups = from invader in invaders
                                  where invader.Location.X < pixxel + invader.image.Width-100 //boundaries.Width - 300
                                  orderby invader.Location.Y descending
                                  //select invaderGroup;
                                  group invader by invader.Location.Y into invaderGroup
                                  select invader;
          }
              if (directionChanged)
              {


                  if (direction == Direction.Right)
                  {
                      direction = Direction.Left;
                  }
                  else
                     
                      direction = Direction.Right - boundaries.Width-100;

              }
         
              //}//End timercount
          //End foreacht invader
          return directionChanged;
      }//End method

      private void MoveInvaderReal()
      {
          if ((TimerCounter % TheSpeed) == 0)
          {
              //TimerCounter = 0;

              foreach (Invader invader in invaders)//These method returns a list with the moving invaders.
              {
                  invader.Move(direction);
              }
          }
          TimerCounter++;
      }
[/code]

U see there are 2 methods. But the invaders are moving from right - left and back to left. But then the invaders are going off screen and dont come back :(.

THX for helping me!!