Start and Kill Processes in C#
A system process is uniquely identified on the system by its process identifier. Using the Process component, you can obtain a list of the processes that are running, or you can start a new process in the system. The System.Diagnostics namespace provides classes that allow you to interact with system processes, event logs, and performance counters.
Process.GetProcessesByName("calc") - Creates an array of new Process components and associates them with all the process resources on the local computer that share the specified process name. The following C# program allows to start multiple calculator applications and later it kill the same instances of all calculator applications.