How to enforce only 1 instance can be running at the same time?

[babylon]

e.g. we can only start one instance of Outlook Express (vs multiple instance
of IE)
How should this be implmented in winform?

thx

 

[Brian P. Hammer]

I run my app from a sub main and this is how I was shown to do it.

Imports System.Threading

Private m As Mutex
Sub Main()
Dim first As Boolean
m = New Mutex(True, "Your App Name Here", first)
If Not (first) Then
MessageBox.Show("The Application is already running.")
AppRunning()
Exit Sub
End If


Private Sub AppRunning()
Application.Exit()
End Sub

 

[babylon]

it works~!
cool.

so the name of the mutex is system-wide, right?

thx

 

[Bob Powell [MVP]]

My Windows Forms tips and tricks page has an article on this.

http://www.bobpowell.net/tipstricks.htm

--
Bob Powell [MVP]
C#, System.Drawing

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

Read my Blog at http://bobpowelldotnet.blogspot.com

 

[Herfried K. Wagner [MVP]]

e.g. we can only start one instance of Outlook Express (vs multiple instance
of IE)
How should this be implmented in winform?

<http://groups.google.com/groups?selm=#[email protected]>

Keywords: Mutex, 'App.PrevInstance', single instance, Tom Shelton.

 

[Brian P. Hammer]

System wide meaning on a single computer... Yes. Network wide of web
wide... I don't think so.