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Run Only One Copy Of Application

, 6 Nov 2011 CPOL
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Yet another way to this is as follows: using System;using System.Collections.Generic;using System.Windows.Forms;using System.Threading;namespace OnlyOneInstance{ static class Program { [STAThread] static void Main() { bool...
Yet another way to this is as follows:

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Threading;
namespace OnlyOneInstance
    static class Program
        static void Main()
            bool instantiated;
          /* If instantiated is true, this is the first instance of the application; else, another instance is running. */
            Mutex mutex = new Mutex(true, "UniqueID", out instantiated);
            if (!instantiated)
                MessageBox.Show("Already Running");
            Application.Run(new Form1());

Take a look there[^] to read the complete article.

To download the sample code, you can go here[^]
After downloading, go to bin directory and then debug OnlyOneInstance.exe file twice, you will see a message box which states Program Already Running.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralMy vote of 5 PinmemberTejas_Vaishnav27-Jun-12 4:36 
GeneralRe: My vote of 5 PinmvpRaviRanjankr27-Jun-12 5:34 
GeneralRe: No the boolean can be either user or the person using code s... Pinmembercharles henington25-Apr-11 12:24 
GeneralRe: I'm confused. First you tell me both implementations are the... PinprotectorAspDotNetDev22-Apr-11 16:27 
GeneralRe: A new instance of form will not run if value is set to true ... Pinmembercharles henington22-Apr-11 7:09 
GeneralRe: Notice the return statement that occurs before the Form1 con... PinprotectorAspDotNetDev19-Apr-11 13:03 
GeneralReason for my vote of 5 Nice and simple. I like it. PinmemberCollin Jasnoch7-Nov-11 12:02 
GeneralRe: Thanks Collin :) PinmvpRaviRanjankr7-Nov-11 20:16 
GeneralReason for my vote of 3 prefer non null return values PinmemberchrisKennedy19-May-11 14:58 
GeneralReason for my vote of 5 its easy to use PinmemberRK_DBA14-Apr-11 18:42 
GeneralReason for my vote of 5 good-good, very good. Pinmemberashishkumar00823-Mar-11 20:51 
GeneralHmm... just a quick thought: regarding Windows 7 (and perhap... PinmemberNenad L.22-Mar-11 4:08 
GeneralI think I prefer this technique over the original because th... PinprotectorAspDotNetDev19-Mar-11 19:15 
GeneralRe: it's the exact same code just reworded To include as class f... Pinmembercharles henington19-Apr-11 12:36 
GeneralTrue that is another way to do the same thing. The reason th... Pinmembercharles henington19-Mar-11 7:37 

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