hi. learning about web services in my diploma course, at http://www.upskilled.edu.au and using http://www.pluralsight.com and reading the transcript, ado dot net. have projects, and have a asp . net application, a class, and a win forms c #, and set up all the dlls. and and have a string connection to a string called AWConnection and also using adventure works 2014 database, and using the HumanResources.Department, Business Identity and Department ID tables. when i do a bukld and says it succeded, when i do a control f 5, says the connection could not be found, and it points to line 34, of the conn.Open(); so, do i need the sql server management studio 2014 open and did have it open, and still got the error. and also maybe set the project for the win forms, any help. how to resolve this. did ask my lecturer, but he has not got back to me, and did try googling, but could not seem to find any definite idea. any ideas, or how to fix this. it is a WinDemo. ASPDemo for the basic asp dot net empty project with web pages, and then the class is called DataLayer, and has classes, and the sql logic, then a WinDemo winforms c # application, and have all the dlls added as references. any ideas. marvin.