Tick Count 가져오기

MFC의 GetTickCount와 비슷한 C# TickCount 기능

int tick1 = Environment.TickCount;

..............
// 처리~~
..............

int tick2 = Environment.TickCount;
double elaspsed1 = (tick2 - tick1) / 1000.0;
MessageBox.Show(elaspsed1.ToString() + " Sec");