Question

I would like to know if Deferred Execution can be used for queries in method syntax and query syntax , I’m interested to know if there are any difference. Thanks

Answer 1

Actually there is only method syntax. When you write your query with query syntax, compiler translates it to method syntax (actually to static methods calls).

Example:

Extension method call (method syntax)

var query = sequence.Select(x => x.Property);

Is compiled as (yes extension methods are just a syntax sugar for calls of static class methods)

var query = Queryable.Select(sequence, x => x.Property);

Same result gives (this is a syntax sugar for same Queryable/Enumerable methods calls)

var query = from x in sequence
            select x.Property;

So, both syntaxes produce same code. Thus there is no difference which syntax you are using – deferred execution (and anything else) will work in the same way.