can't add a .accde MS access file(located outside the project folder) as AccessDataSource

I'm pretty sure that the .accde file does exist. I noticed that V开发者_Python百科S asks for .mdb file, but a .accde is also a MS Access generated database file.

Here is the screenshot(hope it helps):

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From the MSDN AccessDataSource page.

The AccessDataSource class does not support connecting to Access databases that are protected by a user name or password, because you cannot set the ConnectionString property. If your Access database is protected by a user name or password, use the SqlDataSource control to connect to it so that you can specify a complete connection string.

So the .accde is protected in terms of security. Try use SqlDataSource.