Basic: A Recursive Function to Find All Control ID's in a Control

Sometimes you might have a control that has a lot of other controls burried in it. Here is a small very basic recursive function to find all the control id's. I'm posting it more for my reference. Just pass in a string builder and an int.

void RecurseFindControls(Control c, ref System.Text.StringBuilder sb, ref int iLevel)
    {
      if (c.ID != null)
      {
        sb.Append ( c.ID + "[" + iLevel.ToString () + "];" );
      }
      if ( c.Controls.Count > 0 )
      {
        iLevel++;
        for ( int j = 0 ; j < c.Controls.Count ; j++ )
        {
          RecurseFindControls ( c.Controls[ j ], ref sb, ref iLevel );
        }
      }
    }