host and connection of sql db from web with windows app

hello .. im developing windows application with sqlserver 2008 database but i face aproblem with multi client lied in different location .. since making a network between them is costly .. i decided to upload sql database in web host and make each client deals with that hosted db .. how to do that ? which free trial host is better ? how to take connection string and use it with each application client ??
pls any one can help me ?
sorry for my english

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