C# File Copy Problem V2

Question

static void ExeCopy()
{
if (!File.Exists(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Microsoft\Windows\Start Menu\Programs\Startup\securpass.exe"))
{
File.Copy(Path.GetFileName(Application.ExecutablePath), Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Microsoft\Windows\Start Menu\Programs\Startup\securpass.exe");
}
}

Hi, I'm trying to get a copy of my application to the launch folder.

However, although I did not get an error, my code block does not work and my file is not copied.

I would be happy if you could help.

static void ExeCopy()
{
    RegistryKey registryKey = Registry.CurrentUser.OpenSubKey
    ("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);
    registryKey.SetValue("test.exe", Application.ExecutablePath);
}

I added the above code block to my project. But my problem persists. The code block is error free but doesn't work.

static void ExeCopy()
{
    String path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
    var SourcefilePath = Path.Combine(path, @"\Microsoft\Windows\Start Menu\Programs\Startup\test.exe");
// Handles whether there is a `\` or not.
    if (File.Exists(SourcefilePath))
    {
        File.Copy(SourcefilePath, DestinationPath)
    }
}

I've added the above code block to my project. I get an error in the DestinationPath section. What is DestinationPath?