What i mention as a return Type : Here i'm  writing Linq query for Guoup By but what i mention as return type 

 

     public IEnumerable<Market_Masters> GetMaster()
            {
                var x = from n in db.Masters
                        join chil in db.ChildMasterMasters on n.MasterId equals chil.MasterId into t
                        select new
                        {
                            n.MasterId,
                            n.Prod_Name,
                            n.Produ_Adress,
                            n.Price,
                            Hello = t
                        };
                return ;
    
            }

if i write .ToList() its through an Error