[drv]

This is broken in a different way (assuming you mean something like the following):

  int c = this.MyControl.TabPages.Count;
  for ( int i=0; i < c; i++ )
  {
     this.MyControl.TabPages.Remove ( this.MyControl.TabPages[i] );
  }

Let's say you have 4 items. That'll go something like this:

  Original list: (0,1,2,3)
  Remove 0    Item 0 removed, items (1,2,3) become (0,1,2)
  Remove 1    Item 1 (originally 2) removed, items (0,2) become (0,1)
  Remove 2    Only two elements left in the list (0 and 1), so there is no index 2 anymore...