More more info: If I go to some code file and type "Properties.Settings.Default." I do get my connection string in intellisense. So why cant the Dataset find it?

More info: I created the dataset in another project that is working then copied it to my problem project. Everything compiles, but when I try to Preview Data in the tableadapter I get: "Unable to find connection 'conn name here' for object 'Settings'. The connection string could not be found in application settings, or the data provider associated with the connection string could not be loaded."