Most stopwatch.dll implementations rely on the Win32 API function QueryPerformanceCounter (QPC) to achieve microsecond or nanosecond precision.

A standard tool for .NET files that shows the underlying code structure and metadata.

It returns time in various formats, such as Elapsed (as a TimeSpan ), ElapsedMilliseconds , or raw ElapsedTicks . How to Analyze the DLL

Tools like .NET Reflector or ILSpy can reconstruct the original source code from the DLL. Common Use Cases Stopwatch Class (System.Diagnostics) - Microsoft Learn