BL.SeguimientoPacientes.GetPatologiasId C# (CSharp) Méthode

        public Int32 GetPatologiasId(string nom_pat)
        {

            int id = 0;

            var query = from diag in entities.diagnosticos
                        where nom_pat == diag.diagnostico1
                        select diag.id;

            id = Convert.ToInt32(query.FirstOrDefault());



            return id;
        }