### основы LINQ

```
string[] teams = {"бампер", "катки", "тонер", "лобаш", "мафон"};

var selectedTeams = new List<string>();

foreach(string s in teams)
{
    if (s.ToUpper().StartsWith("Б"))
        selectedTeams.Add(s);
}
    
selectedTeams.Sort();
 
foreach (string s in selectedTeams)
    Console.WriteLine(s);
```
## Вывод

```
бампер
```

### 2

```
string[] teams = {"бампер", "катки", "тонер", "лобаш", "мафон"};
 
var selectedTeams = from t in teams 
    where t.ToUpper().StartsWith("к") 
    orderby t 
    select t; 
 
foreach (string s in selectedTeams)
    Console.WriteLine(s);
```

## Вывод

```
катки
```

### 3

```
string[] teams = {"бампер", "катки", "тонер", "лобаш", "мафон", "вонючка"};
 
var selectedTeams = teams
    .Where(t=>t.ToUpper().StartsWith("т"))
    .OrderBy(t => t);
 
foreach (string s in selectedTeams)
    Console.WriteLine(s);
```

## Вывод

```
тонер
```

### 4

```
using System;
List<User> users = new List<User>
{
    new User {
        Name="Толян",
        Age=19,
        Languages = new List<string> {
            "английский", "немецкий" }},
    new User {
        Name="Максон",
        Age=23,
        Languages = new List<string> {
            "английский", "французский" }},
    new User {
        Name="Юрас",
        Age=32,
        Languages = new List<string> {
            "английский", "испанский" }},
    new User {
        Name="Лехыч",
        Age=54,
        Languages = new List<string> {
            "испанский", "немецкий" }}
};

var selectedUsers = users.Where(u => u.Age > 25);

foreach (User user in selectedUsers)
    Console.WriteLine($"{user.Name} - {user.Age}");
public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
    public List<string> Languages { get; set; }
}

```

## Вывод

```
Юрас - 32
Лехыч - 54
```

### 5

```
List<User> users = new List<User>()
{
    new User { Name = "Толян", Age = 19 },
    new User { Name = "Максон", Age = 23 },
    new User { Name = "Юрас", Age = 32 },
    new User { Name = "Лехыч", Age = 54 }
};

var result = users
    .OrderBy(u => u.Name)
    .ThenBy(u => u.Age);

foreach (User u in result)
    Console.WriteLine($"{u.Name} - {u.Age}");

public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
}
```
## Вывод
```
Лехыч - 54
Максон - 23
Толян - 19
Юрас - 32
```
#### THE END...