Hai Frnds, Iam beginner to dotnet. Please explain mr below in detail.


class User : IComparable {
private string firstName;
private string lastName;

public User(string fn, string ln) {
this.firstName=fn;
this.lastName=ln;
}
//I did not understand this below method at all..please be clear here
public int CompareTo(object obj) {
User u=(User)obj;
if (this.lastName==u.lastName) {
return this.firstName.CompareTo(u.firstName);
} else {
return this.lastName.CompareTo(u.lastName);
}
}

public override string ToString() {
return lastName+" "+firstName;
}

Thanking you in advance