Why I see red line under this statement

Question

Hello,

When I want to use these lines I encounter a red line under seek and copy to. And

Warns me up "Are you missing a directive"?
What should I do?

 var state = _instaApi.GetStateDataAsString();


            using (var fileStream = File.Create(stateFile))
            {
                state.Seek(0, SeekOrigin.Begin);
                state.CopyTo(fileStream);
            }

Thanks,

Answer 1

I think that you should do this:

var state = _instaApi.GetStateDataAsString( );
File.WriteAllText( stateFile, state);