Razor: No overload for method 'Write' takes 0 arguments

Try this:

@{ int i = 4; }
@foreach (string s in "1,2,3".Split(',')) {
   @:s is equal to @s
   i++
}

or

@{ int i = 4; }
@foreach (string s in "1,2,3".Split(',')) {
   <text>is equal to @s</text>
   i++;
}