#!meta

{"kernelInfo":{"defaultKernelName":"csharp","items":[{"name":"csharp","aliases":[]}]}}

#!csharp

var greetingDateTime = "Hello, World! Now is "
 +  DateTime.Now.ToString("s")
 + " but yesterday was: "
 + DateTime.Now.AddDays(-1).DayOfWeek ;

#!csharp

using System.Globalization;
return DateTime.Now.AddDays(-7).ToString("D", CultureInfo.CreateSpecificCulture("pt-BR"));

#!csharp

var lotto = new Random().Next(1, 39); 

#!csharp

int? maybeNull = null;
int first; if (maybeNull.HasValue) { first = maybeNull.Value; } else { first = -1; }
int scnd = maybeNull.HasValue ? maybeNull.Value : -1;
int thrd = maybeNull ?? -1;

#!markdown

| ☐ | ☑ | ☎ |
| - | - | - |
| **no** | *yes* | ***mermaid*** | 
| 🗙 | ✓ | ![](https://users.aalto.fi/~ltuuri/apu/javascript/mermaid/.mermaid.jpg) |