Cant find .wsdl file for web service!

I have made a web service in .Net and when I try to add a web reference to my windows application and type in http://localhost/TasksWS/Service1.asmx it never finds the reference. I have seen people say to type in the location of the wsdl file, but I looked and .Net did not create one. Is there something I have to do for .Net to create the wsdl file? Thanks for any help.