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Video tip C#: Ensure only one instance is running

, 24 Oct 2011 CPOL
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How to ensure that only 1 instance of the windows application is running
In this trick, we will try to understand how we can ensure that only one instance of a C# program is running on a computer. I have also created a simple video for the trick below. So you can either see the video or read the below textual description.[^]
First, import the system.diagnostic namespace.
using System.Diagnostics;
Second, use the process object to get the process name.
// we need to get the current process name
string strProcessName = Process.GetCurrentProcess().ProcessName;
Find the process name in the current process collection.
// check if this process name is existing in the current running processes
Process[] Oprocesses = Process.GetProcessesByName(strProcessName);
Depending on the process count, make your decision.
// if its existing then exit
if (Oprocesses.Length > 1)
MessageBox.Show("The application is already running");
// else let the below code run
Application.Run(new Form1());


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


About the Author

Shivprasad koirala
India India

I am a Microsoft MVP for ASP/ASP.NET and currently a CEO of a small
E-learning company in India. We are very much active in making training videos ,
writing books and corporate trainings. Do visit my site for 
.NET, C# , design pattern , WCF , Silverlight
, LINQ , ASP.NET , ADO.NET , Sharepoint , UML , SQL Server  training 
and Interview questions and answers

Comments and Discussions

QuestionGreat.......... Pinmemberjithesh a10-Nov-14 22:46 
BugVideo is not available PinmemberGaurav.Kumar.Arora27-Oct-14 10:37 
Questionwhere to put this code... Pinmembernarenderkumardhull31-May-13 20:51 
GeneralReason for my vote of 2 Sorry for bad vote, nice video, nice... Pinmemberjohannesnestler24-Jan-12 7:03 
GeneralReason for my vote of 5 Good work,thx PinmemberPranit Kothari26-Dec-11 15:42 
GeneralReason for My Vote of 5 Nice video! once again great work by... PinmvpRaviRanjankr3-Nov-11 20:35 
GeneralReason for my vote of 4 Very useful when you need it PinmemberMember 78028731-Nov-11 13:11 
GeneralReason for my vote of 4 Might be good to add some more infor... PinmemberBrianBissell1-Nov-11 4:04 
GeneralReason for my vote of 5 awesome video PinmemberSanjeevSingh31-Oct-11 20:39 
Suggestionare you sure about the > 1 checking Pinmemberdavidkz231-Nov-11 3:06 

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