Creating the control in runtime

How to read the control value after creating the control at runtime.

Example:- 
Step 1:- 10 Textbox controls is created at runtime.
Step 2:- user enters the details in the textbox.
Step 3:- User clicks on the button control to insert these textbox values then thease values must be inserted into the database.

Here comes the problem, How can I read these textbox control data at runtime. I dont know the controlId & etc..,


Please give me solution & explanation for the problem.......