ChatterService.Web.ChatterProxyService.getSalesforceUserId C# (CSharp) Method

        private string getSalesforceUserId(ChatterSoapService soap, string nodeId)
        {
            Object objUserId = HttpRuntime.Cache[nodeId];

            if (objUserId == null)
            {
                objUserId = soap.GetUserId(profilesService.GetEmployeeId(nodeId));
                HttpRuntime.Cache.Insert(nodeId, objUserId);
            }
            return Convert.ToString(objUserId);
        }