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I'm sorry about my title may be it make you confusing (it's just I don't know what words should I use). My problem is I don't want to allow user to open my application multiple time. Please help. Thank you in advance.

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    Why not? This is a very annoying thing to do to a user. Commented Apr 24, 2013 at 15:46
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    @SLaks: It's not entirely unreasonable; ever try to open a second instance of Skype? Personally there are some cases where it would be more annoying to get a new instance rather than be dropped into an existing one. Commented Apr 24, 2013 at 16:11

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Use the “Make single instance application” flag; in the solution explorer, right-click the project and select properties. See this question for more details.

MSDN documentation here.

Screenshot:

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can u imagine that I'm using a code to check if the process is running to allow only one instance of my application :( just found this solution now, thanks, I feel stupid :)
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Use the “Make single instance application” flag; in the solution explorer

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duplicate answer same as geoff

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