[RoutePrefix("v1/members")]
public class MembersController : ApiController
{
    [Route("{id}")]
    public Member Get(string id)
    {
        DataGateway g = new DataGateway();

        return g.GetMember(id);
    }
}

[RoutePrefix("v1/test")]
public class Test : ApiController
{
    [Route("{id}")]
    public string Get(int id)
    {
        return "value";
    }
}

[RoutePrefix("v1/test")]
public class Test : ApiController

[RoutePrefix("v1/test")]
public class TestController : ApiController