How Do I Process Monitor Using Registry In C#

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C#

Windows

service

hey there,
i want to make a windows service to monitor process specific by user for this i make a win form which contains textbox ,Radio button for time interval like 1 hour, 30 min, 15 min and a button name as save setting. when user click press the button that save is save in registry file.

now what i wants to monitor that process which is save in registry key

can any body tell me how to check that process save in registry is running or not in fixed interval.

this is the code which i am using

protected override void OnStart(string[] args)
{
    timer1.Elapsed += new ElapsedEventHandler(timer1_Elapsed);
    timer1.Interval = 5000;
    timer1.Enabled = true;
    timer1.Start();
    try
    {
        FileStream fs = new FileStream(@"c:\SystemActiveTimeInformation.txt",
        FileMode.OpenOrCreate, FileAccess.Write);
        StreamWriter sWriter = new StreamWriter(fs);
        sWriter.BaseStream.Seek(0, SeekOrigin.End);
        sWriter.WriteLine("=====================================================================================");
        sWriter.WriteLine("System Turn On Time: \t " + DateTime.Now);
        sWriter.Flush();
        sWriter.Close();
        RegistryKey exampleRegistryKey = Registry.CurrentUser.OpenSubKey("ExampleTest");
        using (StreamWriter sw = File.AppendText("d:\\close.txt"))
        if(exampleRegistryKey != null)
        {
            sw.WriteLine("ProcessName = " + DateTime.Now + " Running");
        }
        else
        {
            sw.WriteLine("ProcessName = " + DateTime.Now + " n Running");
        }
    }
    catch
    {
        Exception ex;
    }
   
}
private void timer1_Elapsed(object sender, ElapsedEventArgs e)
{
    RegistryKey exampleRegistryKey = Registry.CurrentUser.OpenSubKey("ExampleTest");
    using (StreamWriter sw = File.AppendText("d:\\close.txt"))
     if(exampleRegistryKey.== ListProcesses())
        {
            sw.WriteLine("ProcessName = " + DateTime.Now + " Running");
        }
        else
        {
            sw.WriteLine("ProcessName = " + DateTime.Now + " NR");
        }
    
}