If selected a value, a field must appear

If selected a value, a field must appear

The case is this..
I have Field 1, Field 2, and Field 3.
Field 2 and Field 3 are hidden...

Field 1 is a dropdown box and has values of: Name 1, Name 2, Name 3

Now, what I wanted to do is...

When a user selects Name 1 in Field 1,
Field 2 will appear..

And when Name 2 is selected,
Field 2 will appear..

I can't seem to do it with this code..
  1. if (input.Field1 ==  "Name1")
    {
        show Field2;
        enable Field2;
    }