public static void MergeWith<T>(this T primary, T secondary)
{
    foreach (var pi in typeof(T).GetProperties())
    {
        var priValue = pi.GetGetMethod().Invoke(primary, null);
        var secValue = pi.GetGetMethod().Invoke(secondary, null);

        bool bnullable = false;

        if (typeof(T).IsGenericType && typeof(T).GetGenericTypeDefinition() == typeof(Nullable<>))
            bnullable = true;

        if (((bnullable && secValue != null) == false) && !priValue.Equals(secValue))
        {
            pi.GetSetMethod().Invoke(primary, new object[] { secValue });
        }
    }
}