Check if another instance of the application is running

//simple,fast but not 100% reliable way to check if there are more instances of the current application
public static bool IsUniqueInstance()
{
    string processName = Process.GetCurrentProcess().ProcessName;
    var currentProcess = Process.GetProcessesByName(processName);
    return currentProcess.Length == 1;
}


//this are more complex and reliable:
//MUTEX version: http://odetocode.com/blogs/scott/archive/2004/08/20/the-misunderstood-mutex.aspx
//MUTEX version with switch to application:  http://sanity-free.org/143/csharp_dotnet_single_instance_application.html