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Got this error message while trying to configure an entitydatasource in the designer:
My .edmx file is in a class library in the same solution. I added the necessary DLL’s and copied the connection to the web.config. The weird part is that I can query the database, and get data just fine, so I know my connection string is correct. Has anybody come across this?
Try this steps:
Rebuild your solution
Go to your class library app.config
Copy the connectionstring of your created EDMx and paste it to
web.config connectionstring section of your asp.net project ..
I also got this error before and this is what i did.
If this does not work try to delete your edmx file(and its connectionstring on app.config) and recreate it. Then follow the above steps again.
Best Regards