“The process cannot access the file” error in Winforms in C#

Question

I made an .sdf file (SQL CE) from an XML file. When the file is ready, I want to attach it to an e-mail. But when I try to attach it, I get this error:

The process cannot access the file......because it is being used by another process

How can I fix it?

Answer 1

Do you have an SqlCeConnection open on the file? Is it open in Visual Studio?

I suggest you use Process Explorer so you can identify the process which has a handle on it.

Answer 2

我猜想是因为SQLCE数据库随程序一起在过程中运行，所以在程序运行时无法独占访问文件。