1 int [] foo = new int[100];
 2 
 3 // Loop 1:
 4 foreach ( int i in foo)
 5   Console.WriteLine( i.ToString( ));
 6 
 7 // Loop 2:
 8 for ( int index = 0;
 9   index < foo.Length;
10   index++ )
11   Console.WriteLine( foo[index].ToString( ));
12 
13 // Loop 3:
14 int len = foo.Length;
15 for ( int index = 0;
16   index < len;
17   index++ )
18   Console.WriteLine( foo[index].ToString( ));
19 
20 

 1 // Loop 3, as generated by compiler:
 2 int len = foo.Length;
 3 for ( int index = 0;
 4   index < len;
 5   index++ )
 6 {
 7   if ( index < foo.Length )
 8     Console.WriteLine( foo[index].ToString( ));
 9   else
10     throw new IndexOutOfRangeException( );
11 }