LINQ Max on nullable datatypes

I have an entity as follows.

SchoolDetails

ID Name Rank  School
1  A           Lawrence
2  B      1    Lawrence
3  C      2    Lawrence

I need to fetch the details of student in a particular school(Lawrence) who has highest rank. In this example ID 2 is the desired output.

My linq query is:

var result = SchoolDetails.Where(x=>x.School == "Lawrence").Max(y=>y.Rank).SingleOrDefault();

I get a compliation message saying that “int? doesnt contain a definition for SingleOrDefault”

I cannot change the datatype of Rank column to make it non nullable since it is a production code.
So, given this situation how can I fetch a record with highest rank?

Answers:

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Method 1

Try the below

var result = SchoolDetails.Where(x=>x.School == "Lawrence").OrderByDescending(x => x.Rank).FirstOrDefault();

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