C#: Is pragma warning restore needed?

Question

From msdn I get this:

#pragma warning disable warning-list
#pragma warning restore warning-list

In the examples, both disable

Answer 1

No, you'll find that the compiler will automatically restore any disabled warning once it's finished parsing a source file.

#pragma warning disable 649
struct MyInteropThing
{
    int a;
    int b;
}
#pragma warning restore 649

In the above example I've turned of warning CS00649 because I intend to use this struct in an unsafe manner. The compiler will not realize that I will be writing to memory that has this kind of layout so I'll want to ignore the warning:

Field 'field' is never assigned to, and will always have its default value 'value'

But I don't want the entire file to not be left unchecked.