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Possible Duplicates:
What is the correct way to create a single instance application?
What is a good pattern for using a Global Mutex in C#?
Suppose i have created an exe i want that exe must run only once ..how it is possible please give suggestion
If I understand your problem correctly this has nothing to do with having a singleton implementation. You simply need to check if your executable is currently running.
You can do this by calling Process.GetProcesses() or Process.GetProcessesByName(NameOfExecutable) and checking the return values.
Alternatively use a Mutex as suggested above by others.