Which way?

Way 1:
public static int MemoryAddress(this Ped ped)
{
    PropertyInfo info = typeof(Ped).GetProperty("MemoryAddress", BindingFlags.NonPublic | BindingFlags.Instance);
    var address = info.GetValue(ped, null);

    return (int)address;
}

Way 2:
public static int MemoryAddress(this Ped ped)
{
    PropertyInfo info = typeof(Ped).GetProperty("MemoryAddress", BindingFlags.NonPublic | BindingFlags.Instance);
    int address = (int)info.GetValue(ped, null);

    return address;
}