how to generate dynamic control and save in database

Question

How to create a functionality in asp.net c# with SQL SERVER database my task is: if i select a carpet design in dropdownlist and a color in another dropdownlist and when i select color after that i want to create 2/3 textboxes dynamicaly by click ADD button

and enter some data and click save button  all entered data should save in sql server database.

and if again click on ADD button then again 2/3 textboxes are generated and enter value and click on save button record should be saved in sql server database