> For the complete documentation index, see [llms.txt](https://docs.soraco.co/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.soraco.co/docs/api-reference/.net-api/iqlmhardware/getusbserialnumber.md).

# GetUSBSerialNumber

### Description

Gets the serial number of a USB key from the path where the application is running.

```csharp
string GetUSBSerialNumber ()
```

### Return

| Type   | Description                           |
| ------ | ------------------------------------- |
| string | return the serial number of a USB key |