Please reinstall all required packages by all projects.
A working solution is available on Azure.
Database Connection in DataAccessLayer in DEBUG mode is connected to a local SQLSERVER.
RELEASE mode is by default connected to Microsoft Azure at: Server=tcp:netproj.database.windows.net,1433; Initial Catalog=HotelDataDevelop; Persist Security Info=False; User ID=net;Password=User@123; MultipleActiveResultSets=False;Encrypt=True;