Replace previous files in windows setup

I have created a setup using VS2008 setup wizard. It works fine and installs my application well. But the problem is that when a user installs a new version开发者_如何转开发 of the app, the setup doesn't overwrite the previous Database.

For example in v1.1 I have a db with 2 tables but in 1.2 I added 1 more table so when a user with v1.1 installs v1.2 the setup doesn't remove the 1.1 db. Hence the user uses an old db with 2 tables and the app fails to work properly.

I am using c#