public async Task PPFormParticipate(PApiFormParticipateViewModel pafvm)
        {
            PFormViewModel obj = pafvm.pfm;
            int            fid = pafvm.fid;

            await _ps.FormParticipateAsyncP(fid, obj);
        }
        public async Task <PApiFormParticipateViewModel> FormParticipate(PApiFormParticipateViewModel fpvm)
        {
            int fid = fpvm.fid;
            int cid = fpvm.cid;

            if ((await CheckUserFormParticipation(fid)).Equals(true))
            {
                return(null);
            }
            else
            {
                var v = await _ps.FormParticipateAsync(fid);

                fpvm.pfm = v;

                return(fpvm);
            }
        }