Get Vales from dynamically Added Controls inside Gridview

Question

Hi,

       I have a form in which there is one GridView and one Add Row Button. Following is my code logic :

•  When i click on add row a new row gets added with three columns. In the first 2 columns there are Dropdowns. The first dropdown is coming filled by default and second gets filled on the selection of first.
• On selecting any values from second dropdown a dynamic control gets added in the third column say Textbox / Dropdown / Label.
• Now till here everything is working fine and also i am re-creating the controls after every postbacks like Add Row button click or dropdown changing event.
• Now from where can i get the values entered inside the dynamically added controls like Textboxes / Dropdown.,etc  Please help.