public HttpResponseMessage GetPermissions(PermissionsViewModel model)
        {
            try
            {
                List <PERMISSION> rights = new List <PERMISSION>();
                int limit = int.Parse(model.limit);
                int start = 0;
                if (model.page == "1")
                {
                    start = 0;
                }
                else
                {
                    start = ((int.Parse(model.page) * int.Parse(model.page)) - 5) + 1;
                };
                rights = ApplicationRoleManager.GetPermissions(start, limit);
                int count = ApplicationRoleManager.GetPermissionsCount();
                model.ListDiritti = rights;
                model.Totale      = count.ToString();
            }

            catch (Exception ex)
            {
                model.success = "false";
                model.message = ex.Message;
            }
            return(this.Request.CreateResponse <PermissionsViewModel>(HttpStatusCode.OK, model));
        }