Check if instance of program is already running

[Henry]

oHi,

I want to check for a Windows form program if an instance of the prgram is
already running: if yes the program's window should be activated and no
second program instance should be started.

How can I perform this task in VB.Net?

Thanks in advance.
--
Best regards

Henry

[Herfried K. Wagner [MVP]]

"Henry" <he********@nospam.nospam> schrieb:

I want to check for a Windows form program if an instance of the prgram is
already running: if yes the program's window should be activated and no
second program instance should be started.

Detecting another instance of the application:

<URL:http://www.yoda.arachsys.com/csharp/faq/#one.application.instance>

Bringing a window into the foreground (requires the window's handle, which
can be obtained by getting the process' 'Process' object and getting its
'MainWindowHandle' property value):

<URL:http://groups.google.de/groups?selm=%23gCaV7yaEHA.996%40TK2MSFTNGP12.phx.g bl>

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

[Cor Ligthert]

Henry,

When you are sure that your program name is a real unique name than this one
is very simple.
\\\
Private mut As New Threading.Mutex(True, "myProgram", mutCreated)
Private Sub Form1_Load(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
If Not mutCreated Then Me.Close()
'etc
End Sub
//
I hope this helps?

Cor

[Henry]

Thanks Cor and Herfried!

That is exactly what I needed and it works quite fine.

Best regards

Henry

"Herfried K. Wagner [MVP]" wrote:

"Henry" <he********@nospam.nospam> schrieb:

I want to check for a Windows form program if an instance of the prgram is
already running: if yes the program's window should be activated and no
second program instance should be started.

Detecting another instance of the application:

<URL:http://www.yoda.arachsys.com/csharp/faq/#one.application.instance>

Bringing a window into the foreground (requires the window's handle, which
can be obtained by getting the process' 'Process' object and getting its
'MainWindowHandle' property value):

<URL:http://groups.google.de/groups?selm=%23gCaV7yaEHA.996%40TK2MSFTNGP12.phx.g bl>

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>