如何在C#中获取Teamviewer ID

我以前问过这个问题，但我正试图从注册表中获取Teamviewer ID，并在单击按钮时将其显示在消息框中。但是，当我单击所述按钮时，会弹出一个空白消息框，我希望得到一些帮助来解决这个问题。

我检索Teamviewer ID的代码如下；

public static string CollectTeamviewerId()
        {
            var versions = new[] { "4", "5", "5.1", "6", "7", "8" }.Reverse().ToList();
            foreach (var path in new[] { "SOFTWARE''TeamViewer", "SOFTWARE''Wow6432Node''TeamViewer" })
            {
                if (Registry.LocalMachine.OpenSubKey(path) != null)
                {
                    foreach (var version in versions)
                    {
                        var subKey = string.Format("{0}''Version{1}", path, version);
                        if (Registry.LocalMachine.OpenSubKey(subKey) != null)
                        {
                            var clientID = Registry.LocalMachine.OpenSubKey(subKey).GetValue("ClientID");
                            if (clientID != null)
                            {
                                return clientID as string;
                            }
                        }
                    }
                }
            }

以及用于按钮；

private void button4_Click(object sender, EventArgs e)
        {
            MessageBox.Show(LogDataFactory.CollectTeamviewerId());
        }

if (clientID != null)
{
      return clientID.ToString();
}