How to insert into subquery linq in C#?

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C#

LINQ

How to linq insert into values and use subquery.For example insert into tables and insert select subquery.

Insert Into Students(ID,Name,Surname,Class,ClassType,ClassID)(Select ID,Name,Surname,3,A,A1) from StudentsType where ClassType=A group by Id,Name)

What I have tried:

var subquery=from a in StudentsType
             where ..... etc.

var insertquery=   .....    // I dont insert StudentsType to Students table.