Compare Two Objects of the Same Type and List Down the properties which are different.

Compare Two Objects of the Same Type and List Down the properties which are different.

Here I have class as bellow

public class ClassA
{
    public int ID { get; set; }
    public string Name { get; set; }
    public double Amount { get; set; }
    public DateTime DOB { get; set; }
}

The following function retuns a string which describes a change in properties.

private static string CompareTwo(ClassA oldObj, ClassA newObj)
{
    StringBuilder sb = new StringBuilder();
    sb.Append("The Following feilds has been changed");
    sb.AppendLine();
    foreach (var item in oldObj.GetType().GetProperties())
    {
        if (newObj.GetType().GetProperties().Where(n => n.Name == item.Name && !n.GetValue(newObj, null).Equals(item.GetValue(oldObj, null))).Count() > 0)
        {
			sb.AppendLine();
            sb.AppendFormat("{0}: From {1} to {2}",item.Name,item.GetValue(oldObj,null),newObj.GetType().GetProperties().FirstOrDefault(n => n.Name == item.Name).GetValue(newObj,null));
        }
    }
    sb.AppendLine();
    return sb.ToString();
}

The main method of console app can be written as

static void Main(string[] args)
{
    ClassA oldclass = new ClassA { ID = 1, Amount = 2.5, Name = "Old", DOB = new DateTime(2010, 1, 1) };
    ClassA newclass = new ClassA { ID = 1, Amount = 3.5, Name = "New", DOB = new DateTime(2010, 3, 3) };

    Console.WriteLine(CompareTwo(oldclass, newclass));
}

Thanks,
Debata