How to Generate textbox dynamically without clicking any button

Using C# and webform .

1.I have a textbox in which user enters a number between 1 to n. Based on the number entered in the textbox those many textboxes have to be generated dynamically (i mean without pressing any button).
2.Then entering value into the textbox and finally clicking the button, the value will be stored as array/arraylist/hashtable in session . and finally retrieving contents in the in the next page.

Can anyone help me out in doing this??

Thanks in advance