A Naive Object diff extension method

ObjectDiff.cs

 public static class ObjectExtensions
    {
        public static IEnumerable<Change> Diff<T>(this T obj1, T obj2)
        {
            PropertyInfo[] properties = typeof(T).GetProperties();
            List<Change> changes = new List<Change>();

            foreach (PropertyInfo pi in properties)
            {
                object value1 = typeof(T).GetProperty(pi.Name).GetValue(obj1, null);
                object value2 = typeof(T).GetProperty(pi.Name).GetValue(obj2, null);

               
                if (value1 != value2 && (value1 == null || !value1.Equals(value2)))
                {
                    changes.Add(new Change(){Name = pi.Name, Previous = value1, New = value2});
                }
            }

            return changes;
        }

        public static IEnumerable<Change> DeepDiff(this object obj1, object obj2)
        {
            var type = obj1.GetType();
            PropertyInfo[] properties = type.GetProperties();
            List<Change> changes = new List<Change>();

            foreach (PropertyInfo pi in properties)
            {
                object value1 = type.GetProperty(pi.Name).GetValue(obj1, null);
                object value2 = type.GetProperty(pi.Name).GetValue(obj2, null);

                if (value1.GetType() != value2.GetType())
                {
                    changes.Add(new Change() { Name = pi.Name, Previous = value1, New = value2 });
                    continue;
                }

                if (pi.PropertyType != typeof(string) && !value1.GetType().IsValueType && !value2.GetType().IsValueType)
                {
                    var changeset = value1.DeepDiff(value2);
                    changes.AddRange(changeset);
                    continue;
                }
                if (value1 != value2 && (value1 == null || !value1.Equals(value2)))
                {
                    changes.Add(new Change() { Name = pi.Name, Previous = value1, New = value2 });
                }
            }

            return changes;
        }
        
    }
    
    public class Change
    {
        public string Name { get; set; }

        public object Previous { get; set; }

        public object New { get; set; }

        public override string ToString()
        {
            return string.Format("Property {0} changed from {1} to {2}", Name, Previous, @New);
        }

    }