How to sort List by containing text using LINQ

Question

In my list I have string with name and surname, how do I sort it by strings that contains X surname?

For example:

List<Student> students = new List<Student>()
            {
               new Student("John Doe"),
               new Student("Lucy Novak")
            };

With output: Students with surname Doe: John Doe

Answer 1

If you want filter out students with the second name Doe you can put:

 var result = 
   .Where(student => student
      .Name
      .Split(' ', 3, StringSplitOptions.RemoveEmptyEntries)
      .ElementAtOrDefault(1) == "Doe")
   .ToList();

if you want to get all students, but sort them in such a way, that "Doe" are on the top:

 var result = 
   .OrderBy(student => student
      .Name
      .Split(' ', 3, StringSplitOptions.RemoveEmptyEntries)
      .ElementAtOrDefault(1) != "Doe")
   .ToList();

Note != - we can order by bool , but we have false < true

In both cases we Split stundent's Name into at most 3 parts (first name, second name, all the rest names if they are). Then we try to obtain second name by .ElementAtOrDefault(1) and compare it (or null if student doen't have second name) with Doe