> For the complete documentation index, see [llms.txt](https://pinvokeisalive.gitbook.io/pinvoke/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pinvokeisalive.gitbook.io/pinvoke/desktopfunctions/kernel32/setlasterror.md).

# SetLastError

### C# Signature:

```cs
/// <summary>
/// Sets the last-error code for the calling thread.
/// </summary>
/// <param name="dwErrorCode">The last-error code for the thread.</param>
[DllImport("kernel32.dll", SetLastError = true)]
static extern void SetLastError(uint dwErrorCode);
```

### VB.NET Signature:

```cs
Declare Function SetLastError Lib "kernel32.dll" (ByVal dwErrCode As Integer) As Integer
```