> 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/ntdll/ntwritevirtualmemory.md).

# NtWriteVirtualMemory

```csharp
[DllImport("ntdll.dll", ExactSpelling = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe NTSTATUS NtWriteVirtualMemory(
    HANDLE ProcessHandle,
    void* BaseAddress,
    void* Buffer,
    uint NumberOfBytesToWrite,
    [Optional] uint* NumberOfBytesWritten);
```