What is the difference between LINQ query expressions and extension methods

Question

Below are two queries that return the same data. Other then style I am not sure which is better.

What factors influence these queries? What are the benefits of us

Answer 1

Your Sample1 is top level representation of Linq, it is more readable, and while compiling it'll converted to expression tree i.e your Sample2.

var x = from s in db.Surveys
    join sq in db.Survey_Questions on s.ID equals sq.Survey_ID
    join q in db.Questions on sq.Question_ID equals q.ID
    join qg in db.Question_Groups on q.ID equals qg.Question_ID
    where s.Type_ID.Equals(typeID) & s.Type.Equals(type)
    select new { question = sq.Question, status = sq.Status, grp = qg };

you can try below code to get expression for written query

var exp=x.Expression;

Expressions are used when query less complicated