How to handle system.componentmodel.win32exception: 'access is denied' exception ?

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WPF

I developed a wpf application where I want to manage single application instances, and my requirement is to kill old instances and allow new instances to execute further.
i tried below code but i got System.ComponentModel.Win32Exception: 'Access is denied' error when i call runningProcess.Kill() method

What I have tried:

[STAThread]
public static void Main()
{
    Process[] localByName = Process.GetProcessesByName("faceme");
    Process currentProcess = Process.GetCurrentProcess();
    int nProcessID = Process.GetCurrentProcess().Id;

    var runningProcess = (from process in Process.GetProcesses()
                          where
                            process.Id != currentProcess.Id &&
                            process.ProcessName.Equals(
                              currentProcess.ProcessName,
                              StringComparison.Ordinal)
                          select process).FirstOrDefault();

        if (runningProcess != null)
        {
            runningProcess.Kill();
        }

    MyApp.App app = new MyApp.App();
    app.InitializeComponent();
    app.Run();
}