상속: AbstractService
 public string CreateProject(string xml)
 {
     var request = new PostService(HarvestConnection, "projects");
     return PerformRequest(request,xml);
 }
 public string ToggleClientState(int clientID)
 {
     var request = new PostService(HarvestConnection, @"clients/{0}/toggle", clientID);
     return PerformRequest(request);
 }