Question

So at the beginning of my program I have a piece of code that checks to see if another instance of this process is running.

Process process = Process.GetCurrentProcess();
bool isProcessRunning = (Process.GetProcessesByName(process.ProcessName)).Length > 1;

If the the process is running then I open a message box that says the process is already running and asks the user if they want to terminate the current process and open a new one.

If the dialog result is yes then I use process.kill to close the process. The problem is I will have two of these processes running, so how do I specify which one to close? The process name will be exactly the same, and I want to close the one that was opened first.

Answer 1

Loop through the processes with the same name and check if the Id is different. If it is, kill it.

Process process = Process.GetCurrentProcess();
var dupl = (Process.GetProcessesByName(process.ProcessName));
if( dupl.Length > 1 && MessageBox.Show("Kill?", "Kill duplicates?", MessageBoxButtons.YesNo) == DialogResult.Yes ) {
    foreach( var p in dupl ) {
        if( p.Id != process.Id )
            p.Kill();
    }
}