using System;

void Increment(ref int number)
{
    number++;
}

int value = 5;
Increment(ref value);
Console.WriteLine(value);

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string name;
if (user.InputName != null && user.InputName.Trim() != "")
{
    name = user.InputName.Trim();
}
else
{
    name = "Гость";
}

var name = string.IsNullOrWhiteSpace(user.InputName)
    ? "Гость"
    : user.InputName.Trim();

using System;
using System.Net.Http;
using Microsoft.Extensions.DependencyInjection;

var services = new ServiceCollection();

services.AddHttpClient("github", client =>
{
    client.BaseAddress = new Uri("https://api.github.com/");
    client.DefaultRequestHeaders.UserAgent.ParseAdd("CSharpReadySample");
});

var provider = services.BuildServiceProvider();

var factory = provider.GetRequiredService<IHttpClientFactory>();

using var client = factory.CreateClient("github");

var response = await client.GetAsync("repos/dotnet/runtime");
var content  = await response.Content.ReadAsStringAsync();

Console.WriteLine(content[..200] + "...");

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var lastChar = input[input.Length - 1];
var withoutLast = input.Substring(0, input.Length - 1);

var lastChar = input[^1];    // последний символ
var withoutLast = input[..^1]; // всё, кроме последнего