C # The application can only be opened once, and only one application can be opened. The application cannot be opened repeatedly.

Source: Internet
Author: User

**************************************** *****
Using system;
Using system. Collections. Generic;
Using system. Windows. forms;

Using system. Threading;

namespace pcbilling_server
{< br> static class Program
{< br> Public static bool bonlyoneinstance = false;

// main entry point of the application.
static void main ()
{< br> bonlyoneinstance = false;
mutex = new mutex (true, application. userappdatapath. replace (@ "/", "_"), Out bonlyoneinstance);

If (! Bonlyoneinstance)
{< br> MessageBox. Show ("the system is running! "," Message ", messageboxbuttons. OK, messageboxicon. information);
system. environment. exit (0);

application. enablevisualstyles ();
application. setcompatibletextrenderingdefault (false);
application. run (New frm_login ();
}< BR >}

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