Add Text Boxes in ASP.Net GridView dynamically

Hi,

    I am having a Event Registration form,in which admin can create a event,a event will have Ticket Categories.So I need to create row with 3 text boxes(Ticket Type,Quantity,Price) if clicked on a link of addnew for example.Like that he can create n no. of tickets,please provide any sample code so that I can implement this functionality,I just need how to create UI and retrieve values from textboxes of GridView.Thanks in advance.