difference between select and where in LINQ [duplicate]

Question

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Linq: What is the difference between Select and Where

What's the difference between

var a = Doc.Document.Where(n => n.Id == id).SingleOrDefault(); 

and

var b = Doc.Document.Select(n => n.Id == id).SingleOrDefault();

Why variable b is a boolean ?

Sorry about my ignorance, I am new to LINQ.

Answer 1

Where Filters a sequence of values based on a predicate. So in the first example you are selecting elements from your list where the function n.Id == id is true.

Select Projects each element of a sequence into a new form, so in your second example you get a list of booleans which is the result of the function n.Id == id on each element.