How to host 3 tier application to IIS WebServer in ASP.Net

Refer:

1. Host ASP.Net Website in Local Windows System IIS
2. How to publish website in visual studio 2010

sir when i try to publish an 3 tier application, only the ui files are publishing but the business layer, data layer files are not publishing with that.

When you publish the code the business and database code is converted to dll inside the bin folder.

if i want to delete or edit anything in busniess or data layer, then how can i do that

After publish you can't edit or delete it. So if you need edit or delete then open the project change it as per your requirement then publish it again.