SQL Server CE不适用于Web应用程序，它不支持同时访问。请改用 SQL Server Express LocalDB 。

SQL Server CE is not meant for Web applications, it doesn't support simultaneous access. Use SQL Server Express LocalDB instead.

我自己解决了它。只是通过文件系统发布了应用程序，并为SQL Server CE 4.0添加了所需的dll。现在工作正常。

I solved it my self.Just published the application via File System and added the needed dll for SQL Server CE 4.0. Now its working fine.