Definitions

Question 1

Define enumerator

Answer 1

An enumerator is a read-only, forward-only cursor over a sequence of values.

Question 2

Define iterator

Answer 2

An iterator produces an enumerator, also, an iterator is a method, property, or indexer that contains one or more yield statements.

Question 3

What is an extension method

Answer 3

An extension method is a static method of a static class, where the this modifier is applied to the first parameter.

Question 4

Define Tuple

Answer 4

Tuples provide a simple way to store a set of values.

The main purpose of tuples is to safely return multiple values from a method without resorting to out parameters.

Example:

var bob = ("Bob", 23);
or
(string, int) bob = ("Bob", 23);

Question 5

Define Attribute

Answer 5

Attributes are an extensible mechanism for adding custom information to code elements (assemblies, types, members, return values, parameters, and generic type parameters).

Question 6

Define Binding

Answer 6

Binding is the process of solving types, members, and operations–at either compile time or runtime.

Question 7

Explain the difference between Formatting and Parsing.

Answer 7

Formatting means converting to a string; parsing means converting from a string.

Question 8

Define subquery

Answer 8

A subquery is a query contained within another query’s lambda expression.