Put things in order and sort it out (using LINQ)

1) How to order/sort a list of custom objects by property

class Person

{

    public string FirstName;

    public string LastName;

    public DateTime DOB;

}

List<Person> people = new List<Person>()

{

    new Person() {FirstName = "Bob", LastName = "Funnyman", DOB = new DateTime(1980, 1, 1) },

    new Person() {FirstName = "Tom", LastName = "Sadman", DOB = new DateTime(1970, 1, 1) },

    new Person() {FirstName = "Abe", LastName = "Justman", DOB = new DateTime(1990, 1, 1) },

    new Person() {FirstName = "Abe", LastName = "Justman", DOB = new DateTime(1984, 1, 1) },

};

List<Person> sortedPeorsonList = people.OrderBy(o => o.DOB).ThenBy(o => o.LastName).ThenBy(o => o.FirstName).ToList();

2a) Create a sorted list of Keys form a Dictionary depending on the values

Dictionary<string, int> stringsDictionary = new Dictionary<string, int>()

{

    ["one"] = 1,

    ["ten"] = 10,

    ["two"] = 2,

    ["four"] = 4,

    ["three"] = 3,

};

List<string> result = (from entry in stringsDictionary orderby entry.Value ascending select entry.Key).ToList();

2b) If you wish sort and to keep the key-pair values
List<KeyValuePair<string, int>> sortedKeyValuePairs = stringsDictionary.OrderBy(d => d.Value).ToList();