Linq query optimization

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LINQ

Dear All

I am new in LINQ this is my LINQ query for the execution of it it takes a long time
if someone can optimize my query i.e is helps me a lot.

var userdetail = new List<UserDetail>();

userdetail = (from student in studentDetails
                              join ud in _Klasscontext.UserDetail
                              on student.StudentUserId equals ud.UserId
                              select ud).ToList();

I want to optimize my code.

What I have tried:

I want to optimize my code.