行添加到ASP。网络显示数据表格?

I have the following GridView which has a couple DropDownLists and TextBoxes. How can I add a new row to it, while persisting the existing GridView. I would like to Add the New row with the LinkButton. I am not using DataSource Controls and the GridView is currently populated via a DataTable. Here is the GridView:I have the following GridView which has a coupl