No matter what I try, I get this error when previewing a report:

An error has occurred while processing Report 'SomeReport': Unable to establish a connection to the database. Please, verify that your connection string is valid. In case you use a named connection string from the application configuration file, make sure the name is correct and the connection string settings are present in the configuration file of your application. ------------- InnerException ------------- Format of the initialization string does not conform to specification starting at index 0.

However, everything works great while in the designer.

Any info would help.

Thanks,
-John