Question

Why two object’s hash code is not same even though they have similar values. What is the other best approach to find value equality among objects with out reading ones each property and have check with other ones property?

                Person person = new Person();
                person.Name = "X";
                person.Age = 25;
                person.Zip = 600056;
                person.Sex = 'M';

                Person person1 = new Person();
                person1.Name = "X";
                person1.Age = 25;
                person1.Zip = 600056;
                person1.Sex = 'M';


                int hashCode1 = person1.Name.GetHashCode();
                int hashCode = person.Name.GetHashCode();

                // hashCode1 and hashCode values are same.

                if (person.GetHashCode() == person1.GetHashCode())
                {
                    // Condition is not satisfied
                }

Answer 1

in your code hashCode1 == hashCode is true because hashing same string will always give you the same result. however insances are different so you have to override GetHashCode() in a way that fits your business logic for example

    public override int GetHashCode()
    {
        return Name.GetHashCode() ^ Zip.GetHashCode() ^ Sex ^ Age;
    }

I sugest you take a look at this answer GetHashCode Guidelines in C#.

and http://musingmarc.blogspot.com/2007/08/vtos-rtos-and-gethashcode-oh-my.html