public object Test_Query()
        {
            var r      = HttpContext.Current.Request;
            var query  = r.GetF("query");
            var bll    = new BStudent();
            var schema = new Schema {
                Query = new StudentQuery(bll), Mutation = new StudentMutation(bll)
            };
            var result = new DocumentExecuter()
                         .ExecuteAsync(options => {
                options.Schema = schema;
                options.Query  = query;
            }).GetAwaiter();
            var json = new DocumentWriter(indent: true).Write(result);

            return(result.GetResult());
        }