[Solved] Which type should I return?

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You can’t return anonymous types from a method (i.e. select new { ... }). You need to create a class for that or use Market_Masters if it is of that type, e.g.:

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 Market_Masters()
                {
                    MasterId = n.MasterId,
                    Prod_Name = n.Prod_Name,
                    Produ_Adress = n.Produ_Adress,
                    Price = n.Price,
                    Hello = t
                };

    return x.ToList();
}

If the type returned is not Market_Masters you could do something like (replace YourChildType with your actual type):

public class MarketMastersWithHello : Market_Masters
{
    public IEnumerable<YourChildType> Hello { get; set; }
}

and then:

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

    return x.ToList();
}

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solved Which type should I return?