What is the result of List.OrderBy(), if multiple entries have the same value?

Question

I am getting a strange behavior with the OrderBy() Method of Lists.

Imagine you have a List and each Person has Firstname, Lastname and Gender. If all People in this list are of Gender "m", I will get a different sorting after each call of

list.OrderBy(p => p.Gender)

But I don't want my list to jump around on each and every refresh. Any idea on this?

Answer 1

You can use ThenBy() to sort it using other properties if Gender is same. Like this:

list.OrderBy(p=>p.Gender).ThenBy(p=>p.FirstName);