How to specify an Order or Sort using the C# driver for MongoDB?

Question

You can also do it using the SetSortOrder method on the MongoCursor class:

db["collection"].Find().SetSortOrder(SortBy.Ascending("SortByMe"));

Just to add to Chris's answer, in C# Driver 2.x it is now done with SortBy, SortByDescending, ThenBy & ThenByDescending

collection.Find(bson => true).SortBy(bson => bson["SortByMeAscending"]).ThenByDescending(bson => bson["ThenByMeDescending"]).ToListAsync()

Now it resembles Linq even more.

http://mongodb.github.io/mongo-csharp-driver/2.0/reference/driver/crud/reading/#sort

For async methods:

var filter = Builders<BsonDocument>.Filter.Empty;
var sort = Builders<BsonDocument>.Sort.Ascending("time");
collection.FindAsync(filter, new FindOptions<BsonDocument, BsonDocument>()
{
    Sort = sort
});

Simple usage of api in MongoDB.Driver 2.5.0

var client = new MongoClient("mongodb://localhost:27017");

var database = client.GetDatabase("Blog");

var list = database.GetCollection<BlogPost>("BlogPost")
    .Find(e => e.Deleted == false)
    .SortByDescending(e => e.CreatedOn)
    .Limit(20)
    .ToList();

Note that to sort on multiple fields use this:

db["collection"].Find().SetSortOrder(SortBy.Ascending("SortByMe").Descending("An‌​dByMe");

If you want to use linq:

From the documentation: (http://docs.mongodb.org/ecosystem/tutorial/use-linq-queries-with-csharp-driver/)

var query=
    (from c in collection.AsQueryable<C>()
    orderby c.X
    select c)

foreach (var d in query)
{
    // process your documents
}

If you want you can also limit the results:

var query=
    (from c in collection.AsQueryable<C>()
    orderby c.X descending
    select c).Take(1);

Just remember to have an index on the field you are sorting by : ]