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Posted 19 Mar 2011

Run Only One Copy Of Application

, 6 Nov 2011
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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
    {
       
        [STAThread]
        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");
               return;
            }
            Application.Run(new Form1());
            GC.KeepAlive(mutex);
        }
    }
}


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.

License

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

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About the Author

RaviRanjanKr
Software Developer
India India
Microsoft Student Partner | MCTS | CP MVP | Crazy Learner

An Indian, who loves his country, believes in freedom, He is an enthusiast Techie and crazy learner. He is passionate about Technologies. He holds Master in Computer Application and Bachelor degree of CS in Information Technology.

He always excited and keen Interested in learning and sharing knowledge. He loves to learn new things, listen music, taking arts and Playing Games..

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GeneralRe: No the boolean can be either user or the person using code s... Pin
charles henington25-Apr-11 12:24
membercharles henington25-Apr-11 12:24 

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