Coap.Proxy.ClientConnection.PopulateResources C# (CSharp) Method

        private string PopulateResources(Resource currentRoot, String baseUri)
        {
            Resource[] resources = currentRoot.GetSubResources();
            string returnLi="";
            foreach (Resource res in resources)
            {
                if (res.SubResourceCount > 0)
                {
                    returnLi += PopulateResources(res, baseUri);
                }
                else
                {
                    if (res.ResourceType != null && res.ResourceType.ToLower() == "observe")
                    {
                        returnLi += String.Format("<li><a href=\"{0}\">{1}</a><br/><span>*can be observed*</span><br/><span>*resource title:{2}</span></li>", baseUri.Replace("coap", "http") + res.Path, res.Path.Substring(1, res.Path.Length - 1), res.Title);
                    }
                    else
                    {
                        returnLi += String.Format("<li><a href=\"{0}\">{1}</a><br/><span>*resource title:{2}</span></li>", baseUri.Replace("coap", "http") + res.Path, res.Path.Substring(1, res.Path.Length - 1), res.Title);
                    }
                }
            }
            return returnLi;
        }