# Sandbox.BaseFileSystem.GetCrc

```csharp
ulong GetCrc(string filepath)
```

Returns CRC64 of the file contents.

### Parameters

- `filepath` (`string`): File path to the file to get CRC of.

### Returns

`ulong`: The CRC64, or 0 if file is not found.

Declared in [Sandbox.BaseFileSystem](/api/Sandbox.BaseFileSystem).
Assembly: `Sandbox.Filesystem`.