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BLL.test1BLL t1b = new BLL.test1BLL();
BLL.table2BLL t2b = new BLL.table2BLL();
var t2=t2b.GetList(en => true, en => en.table4).FirstOrDefault();
int a = t2.table4.td;
models.test1 t1 = new models.test1();
t1.table2.Add(t2);
t1b.Add(t1);
studyEntities db3 = SingleContext.db2;