Revert "Data folder (GeographyApp.Data namespace) deleted. Generated new ADO.NET Entity Data Model from GeographyApp database. All class and who using CeographyApp.Data namespace were update. GeographyApp.Country class updated(add List<CountryUnion> CountryUnions propety)."

This reverts commit eaabf58daa29b491ac3aead60e13303ebd5ec8f5.