score:15
Accepted answer
You don't assign result of OrderByDescending
leaves = leaves.OrderByDescending(e => e.StartDate).ToList();
or do
leaves = leaves.Concat(otherleaves).OrderByDescending(e => e.StartDate).ToList();
score:0
OrderByDescending
doesn't order a list, it returns a new ordered IEnumerable. So use the result of OrderByDescending to display your items.
score:1
OrderByDescending does not "sort in place". It rather returns an IOrderedEnumerable that you must assign to a variable.
var orderedLeaves = leaves.OrderByDescending(e => e.StartDate);
Source: stackoverflow.com
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