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

# HeapFree

```csharp
[DllImport("KERNEL32.dll", ExactSpelling = true, SetLastError = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe BOOL HeapFree(
    HANDLE hHeap,
    HEAP_FLAGS dwFlags,
    [Optional] void* lpMem);
```

[HEAP\_FLAGS](/memory/heap_flags.md)