indx  name1     name2   name3
1      1            3          5 
2      1            4          6 
3      2            3          7
4      2            4          8

1_ListBox     2_ListBox    3_ListBox
    1                3               5
    2                4               6
                                 7
                                 8 

.CS
     if (spec_sampling_procDomainDataSource.CanLoad)
            {
                LoadOperation<spec_sampling_Result> loadspec_sampling = MainContext.Load(
                    MainContext.Getspec_samplingQuery(Indx_spec));
                    list_Inst.ItemsSource = loadspec_sampling.Entities;
            }

DomainS....
   public IQueryable<spec_sampling_Result> Getspec_sampling(int Indx)
        {
            return this.ObjectContext.spec_sampling(Indx).AsQueryable<spec_sampling_Result>();
        }