Let's say I have a program.exe file. When I run it, one instance of
it will be created.

If I run it again, then another instance will be created. Question
is, is it possible for instance #2 to issue command to instance #1, or
vice versa?

Thanks

Via some form of IPC (remoting, WCF, a shared file, sockets, etc etc
etc), yes.

The implementation depends on what you need...

Marc

There are many-a-ways to achieve that...
1) You can use Mutex
2) At the program constructor, trace the process that are currently running
on the system, take either name or id of the application and compare with the
current.. application.

If you need more details with code, ping me back..

HTH
--
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Don''t forget to rate the post


"Marc Gravell" wrote:

> Via some form of IPC (remoting, WCF, a shared file, sockets, etc etc
> etc), yes.
>
> The implementation depends on what you need...
>
> Marc
>
>
>

Using the process as below

First create a method to get the instance is already running or not as below

using System.Diagnostics;

public static Process PriorProcess()
{
Process curr = Process.GetCurrentProcess();
Process[] procs = Process.GetProcessesByName(curr.ProcessName);
foreach (Process p in procs)
{
if ((p.Id != curr.Id) &&
(p.MainModule.FileName == curr.MainModule.FileName))
return p;
}
return null;
}

Now by using this, you can check at the Main method as

static void Main() // args are OK here, of course
{
if (PriorProcess() != null)
{
MessageBox("Another instance is already running.");
return;
}
Application.Run(new Form1()); // or whatever was here
}

Regarding Mutex usage... if you can do R&D that's great. But if you want me
to post the details here will do that...

HTH and don't forget to rate the post

--
Every thing is perfect, as long as you share!!!

Don''t forget to rate the post


"melon" wrote:

> Let's say I have a program.exe file. When I run it, one instance of
> it will be created.
>
> If I run it again, then another instance will be created. Question
> is, is it possible for instance #2 to issue command to instance #1, or
> vice versa?
>
> Thanks
>
>

Although "one instance only" is a common request, I'm not sure it is
what the OP asked on this occasion?

Marc