freeCodeCamp/guide/english/csharp/is/index.md

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---
title: is
---
## is
The `is` keyword checks if an object is compatible with a given type, or (starting with C# 7) tests an expression against a pattern.
## Example
```csharp
int number = 6;
Console.WriteLine(number is long); // False
Console.WriteLine(number is double); // False
Console.WriteLine(number is int); // True
```
#### More information:
- [C# Reference: is](https://docs.microsoft.com/dotnet/csharp/language-reference/keywords/is)