Single Program instance

wrote in message news:96411b41-31f9-4b3c-9c2f-2719bc0d368e@discussions.microsoft.com...

In .NET 2.0 is there an easy way of ensuring you only have one instance of a Windows Forms app running at any one time?

Thanks

Graham

Wrap your Application.Run call in a using block that encapsulates a global or a local Mutex, like in [1].

A global Mutex prevents multiple instances accross TS sessions, a local Mutex prevents multiple instances per TS session or non TS session.

[1]

bool okToRun;

// prevent multiple instances accross TS sessions

string uniqueAppId = "Global\\UniqueString";

using(Mutex m = new Mutex(true, uniqueAppId , out ok))

{

if (okToRun)

Application.Run (new MainForm());

}

Willy

MVPUser at 2007-8-21 >