sentences:  The ".sdf" file can simply be copied to the destination system for deployment, or be deployed through ClickOnce.SQL CE runtime has support for DataDirectories.Applications using an SQL CE database need not specify the entire path to an ".sdf" file in the ADO.NET connection string, rather it can be specified as "|DataDirectory|\.sdf", defining the data directory (where the ".sdf" database file resides) being defined in the assembly manifest for the application.