The error seems to point out your problem. It sounds like you have placed a method or a property outside of a class definition. For example, this is wrong:
namespace demo
{
public string myData { get; set; }
public class myClass
{
}
}
You would need to move your property inside your class like so:
namespace demo
{
public class myClass
{
public string myData { get; set; }
}
}