Unit Testing Error - The unit test adapter failed to connect to the data source or to read the data

Question

I\'m using VSTS 2K8 and I\'ve set up a Unit Test Project. In it, I have a test class with a method that does a simple assertion. I\'m using an Excel 2007 spreadsheet as my

Answer 1

Change the "Build Action" property of Excel(.xlsx) to Content and "Copy to Output Directory" to Copy if newer.

This worked for me when I got the same error as urs...

++ also dont forget to browse and add the excel file in Deployment tab of TestRun.config file that is in the server soution..:)