using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace _app { class Program { static void Main(string[] args) { //var Running = Yaulw.Win32.COM.GetActiveObjects(""); //var RunningExcelWorkbooks = Yaulw.Win32.COM.GetRunningObjects(); //int n1 = Running.Count(); //int n2 = RunningExcelWorkbooks.Count(); } } }