setup & deployment

I had donie 3 projects in c#.net windows application.And for the deployment, i had to create seperate setup & deploy project for each applications.I would like to know if there is any other way ,for further any changes made in the application to be deployed in simple way to clients pc.What i do now is made modifications is project ,then add files in setup porject & install to clients pc,which is a long process.Also, how can i connect to different database with same exe file for testing purpose(same database with different name or different server).plz help me in this matter.

thanks