Ensure that the application runs only one instance [C #]

Use mutex to ensure applicationsProgramRun only one instance,CodeAs follows:

 Using  System;  Using  System. Collections. Generic;  Using  System. LINQ;  Using  System. Windows. forms;  Using  System. Threading;  Using  System. runtime. interopservices;  Namespace Testplatform {  Static   Class  Program {  Private   Static Mutex _ mutex = Null  ;  Private   Static   String _ Mutexname = "  Onlyone_app  "  ; Private   Static   String _ Titlename = "  Production and testing platform for GPS devices  "  ;  ///   <Summary>          ///  The main entry point of the application.  ///   </Summary>  [Stathread]  Static   Void Main (){  //  Single Instance              Try  {_ Mutex = Mutex. openexisting (_ mutexname); MessageBox. Show (_ titlename + "  Already running. Please confirm!  " , "  Repeated execution is not allowed.  "  , Messageboxbuttons. OK, messageboxicon. Stop); intptr _ HANDLE = Findwindow (Null  , _ Titlename );  If (_ HANDLE! = Intptr. Zero ){  //  MessageBox. Show ("find application ."); Showwindow (_ HANDLE, sw_restore ); //  Restore  } Application. Exit ();}  Catch (Waithandlecannotbeopenedexception ex) //  This mutex does not exist {_ Mutex = New Mutex ( True  , _ Mutexname); application. enablevisualstyles (); application. setcompatibletextrenderingdefault (  False  ); Application. Run (  New  Formmain (); _ mutex. releasemutex () ;}} [dllimport (  "  User32.dll  "  )] Private   Static   Extern Intptr findwindow ( String Classname, String  Windowname); [dllimport (  "  User32.dll  "  )]  Private   Static   Extern   Bool Showwindow (intptr hwnd, Int Ncmdshow );  Private   Const   Int Sw_restore = 9  ;}}