HpToolsLauncher.Helper.GetSTInstallPath C# (CSharp) Method

        public static string GetSTInstallPath()
        {
            string ret = String.Empty;
            var regKey = Registry.LocalMachine.OpenSubKey(ServiceTesCurrentVersionRegistryKey);
            if (regKey != null)
            {
                var val = regKey.GetValue(InstalltionFolderValue);
                if (null != val)
                {
                    ret = val.ToString();
                }
            }
            else
            {
                regKey = Registry.LocalMachine.OpenSubKey(ServiceTesCurrentVersionWOW64RegistryKey);
                if (regKey != null)
                {
                    var val = regKey.GetValue(InstalltionFolderValue);
                    if (null != val)
                    {
                        ret = val.ToString();
                    }
                }
                else
                {
                    ret = GetRootDirectoryPath() ?? string.Empty;
                }
            }

            if (!String.IsNullOrEmpty(ret))
            {
                ret = ret.EndsWith("\\") ? ret : (ret + "\\");
                if (ret.EndsWith("\\bin\\"))
                {
                    int endIndex = ret.LastIndexOf("\\bin\\");
                    if (endIndex != -1)
                    {
                        ret = ret.Substring(0, endIndex) + "\\";
                    }
                }
            }

            return ret;
        }

 /// <summary>
 /// Search ServiceTestExecuter.exe in the current running process directory,
 /// and if not found, in the installation folder (taken from registry)
 /// </summary>
 /// <returns></returns>
 public bool TrySetSTRunner()
 {
     if (File.Exists(STRunnerName))
     {
         return(true);
     }
     _stExecuterPath = Helper.GetSTInstallPath();
     if ((!String.IsNullOrEmpty(_stExecuterPath)))
     {
         _stExecuterPath += "bin";
         return(true);
     }
     _stCanRun = false;
     return(false);
 }