What are the different types of methods in LINQ?

In LINQ (Language Integrated Query) in C#, there are several main types of methods:

1. Projection operators — for example, Select, SelectMany, which transform sequence elements.

2. Filtering operators — for example, Where, which select elements based on a condition.

3. Ordering operators — OrderBy, OrderByDescending, ThenBy.

4. Aggregation methods — Count, Sum, Average, Min, Max.

5. Set operations — Distinct, Union, Intersect, Except.

6. Grouping operators — GroupBy.

7. Element access operators — First, FirstOrDefault, Single, SingleOrDefault, Last.

8. Quantifiers — Any, All.

Example of usage:

var numbers = new List<int> {1, 2, 3, 4, 5};
var evenNumbers = numbers.Where(n => n % 2 == 0).Select(n => n * 10);
foreach(var num in evenNumbers)
{
    Console.WriteLine(num); // 20, 40
}