How can I get a difference between two DateTime intervals in micro and nano seconds?

[srikanth]

QueryPerformanceCounter is giving microseconds
but not in exactly
i have one doubt in this
please check my code once
https://paste.ofcode.org/gg6d6ESDmJHDkxxQmkUkbN

[SGaist]

It depends on the source. You have all the explanations here.