how to create dynami controls on button click ?

Question

hello

 

I created a form with 3 textbox and I want to add another dynamic text box when the user click the button;

Everything working fine, but when I try to read the data using FindControl it doesnt find anything.

If I create the dynamic buttons on Page_Init, its find them,  but if I create then on the button click event it wont find them using FindControl.

 

what can I do ?