Multi User Access in MS SQL Server Compact Edition

Hi Everyone,
 
i want solution urgent. i am developing C# with MS Sql server Compact database. i have trouble with multi user access in the database.'m using sharing concept but its giving error :
 
There is a file sharing violation. A different process might be using the file.[\\JAN-941C126E\Testing_GSm\Debug\\New\GSM.sdf]
 
any other solution?
 
pleas urgent..

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Thanks & Regards,