Allow only one application instance

vb.net single-instance
Norak picture Norak · Apr 24, 2013 · Viewed 14k times · Source

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.

Answer

Geoff picture Geoff · Apr 24, 2013

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:

enter image description here

Related questions

How to make sure that there is one instance of the application is running

I want to check when the user double click on applictaion icon that no another instance of this application is already running. I read about My.Application but i still don't know what to do.

Read More
What is a NullReferenceException, and how do I fix it?

I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object. What does this mean, and what can I do to fix this error?

Read More
Converting string to byte array in C#

I'm converting something from VB into C#. Having a problem with the syntax of this statement: if ((searchResult.Properties["user"].Count > 0)) { profile.User = System.Text.Encoding.UTF8.GetString(searchResult.Properties["user"][0]); } I then see the following errors: Argument 1: cannot …

Read More