Override Equals() ToString() GetHashCode() operators == !=

enum specialties
{
    Informatic,HR,QualityAssurance
}

public enum universities
{
    SofiaUniversity,Telerik
}

public enum faculties
{
    RocketScience,AlienHunting
}

class Student : ICloneable
{

    #region Properties
    public string FisrtName { get; private set;}
    public string MidName { get; private set; }
    public string LastName { get; private set; }
    public int SSN { get; private set; }
    public string MobilePfone { get; private set; }
    public string Course { get; private set; }
    public specialties Specialty { get; private set; }
    public universities University { get; private set; }
    public faculties Faculty { get; private set; }
    #endregion

    #region Methods
    public override bool Equals(object obj)
    {
        Student student = obj as Student;

        if (student == null)
        {
            return false;
        }
        //compare reference types
        if (!object.Equals(this.FisrtName, student.FisrtName))
        {
            return false;
        }
        if (!object.Equals(this.MidName, student.MidName))
        {
            return false;
        }
        if (!object.Equals(this.LastName, student.LastName))
        {
            return false;
        }
        //compare value types
        if (this.SSN != student.SSN)
        {
            return false;
        }

        return true;
    }

    public override int GetHashCode()
    {
        return this.FisrtName.GetHashCode() ^ this.SSN.GetHashCode();
    }
    public override string ToString()
    {
        return string.Format("First name: {0}, midle name: {1}, last name: {2}, SSN: {3}, mobile pfone: {4}, course: {5}, specialty: {6}, university: {7}, faculty: {8}",
            this.FisrtName,this.MidName,this.LastName, this.SSN,this.MobilePfone,this.Course,this.Specialty,this.University,this.Faculty);
    }
    //operators
    public static bool operator ==(Student st1, Student st2)
    {
        return object.Equals(st1, st2);
    }
    public static bool operator !=(Student st1, Student st2)
    {
        return !object.Equals(st1, st2);
    }
    //deep clone
    public object Clone()
    {
        return new Student(FisrtName = this.FisrtName,MidName= this.MidName,LastName = this.LastName,SSN = this.SSN, MobilePfone = this.MobilePfone,Course = this.Course,
        Specialty = this.Specialty, University = this.University, Faculty = this.Faculty);
    }
    //CompareTo()
    public int CompareTo(Student student)
    {
        if (this.FisrtName != student.FisrtName)
        {
            return (this.FisrtName.CompareTo(student.FisrtName));
        }
        if (this.MidName != student.MidName)
        {
            return (this.MidName.CompareTo(student.MidName));
        }
        if (this.LastName != student.LastName)
        {
            return (this.LastName.CompareTo(student.LastName));
        }
        if (this.SSN != student.SSN)
        {
            return (this.SSN - student.SSN);
        }
        return 0;
    }
    //compare
    public static List<Student> Compare(List<Student> studentList)
    {
        return studentList.OrderBy(x => x.FisrtName).ThenBy(x => x.MidName).ThenBy(x => x.LastName).ThenBy(x => x.SSN).ToList();
    }
    #endregion

    #region Constructors
    public Student(string fName, string mName, string lName, int ssn, string mobilePfone, string course, specialties specialty, universities university, faculties faculty)
    {
        this.FisrtName = fName;
        this.MidName = mName;
        this.LastName = lName;
        this.SSN = ssn;
        this.MobilePfone = mobilePfone;
        this.Course = course;
        this.Specialty = specialty;
        this.University = university;
        this.Faculty = faculty;
    }
    #endregion
}

public interface ICloneable
{
    object Clone();
}

public interface IComparable
{
    void Compare();
}

static void Main()
    {
        Student st1 = new Student(null,"Mishev","Petrov",100,"0888345678", "2a", specialties.HR , universities.SofiaUniversity , faculties.RocketScience);
        Student st2 = new Student(null, "Mishev", "Petrov", 100, "0888345678", "2a", specialties.HR, universities.SofiaUniversity, faculties.RocketScience);
        Student st3 = new Student("Mahmud", "Mishev", "Petrov", 999, "0888345678", "4a", specialties.HR, universities.SofiaUniversity, faculties.RocketScience);
        //test equals
        Console.WriteLine(st1.Equals(st2));
        Console.WriteLine(st1.Equals(st3));
        //test tostring
        Console.WriteLine(st1.ToString());
        //test operators
        Console.WriteLine(st1 == st2);
        Console.WriteLine(st1 != st2);
        //test get hash code
        Console.WriteLine(st3.GetHashCode());
        //test clone
        Student cloned = st1.Clone() as Student;
        //test CompareTo
        Console.WriteLine(st1.CompareTo(st2));
        //test compare
        List<Student> studentList = new List<Student>(new Student[] {st1, st2, st3});
        var sorted = Student.Compare(studentList);
    }