using static System.Console;

using System.Linq;

​

public class Program {

    public static void Main() {

        var header = new string[2] { "nome", "endereco" };

        var joao = new string[2] { "joão", "rua santa cruz, 28" };

        var json = header.Zip(joao, (header, data) => "\"" + header + "\" : \"" + data + "\"");

        foreach (var item in json) WriteLine(item);

    }

}