C# How to determine if assembly is running so it cannot be open duplicate? [duplicate]

Question

Possible Duplicate:
Prevent multiple instances of a given app in .NET?
How can I enforce a single instance of my application?

I have a source then complie to App.exe file. I want if App.exe is running, then a person open it again, it know that it is running and close automaticly. Is there any way to do this?

**Edit: I want a code that insert to source of App.exe

Window Form**

Deathspike · Accepted Answer · 2012-08-10 11:20:07Z

You want to use a Mutex, like so:

bool bIsSingleInstance; using (new Mutex(true, Assembly.GetExecutingAssembly().GetName().Name, out bIsSingleInstance)) { if (bIsSingleInstance) { // START APP HERE. } }

Note that you must NOT use 'using' if your winforms isn't blocking in the comment block.

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