Is it ok to Kill EXCEL.exe in C#.?

I'm reading excel file usgin COM object. but after runng code EXCEL.exe remains in process queqe. So I'm using

 System.Diagnostics. Process[] excelProcesses = System.Diagnostics.Process.GetProcessesByName("EXCEL"); 
                  foreach(System.Diagnostics.Process p in excelProcesses) 
                  { 
                    p.Kill(); 
                  } 

to kill EXCEL.exe process Is this ok to use.

If no then why shold not?