How to add the DropDownList and TextBox Control in DetailsView

[Murugan V via DotNetMonster.com]

Hi,
i want to add the DropDownList,TextBox and Label in detailsview dynamically at runtime.At the page load, the detailsview displayed the records.when i click the edit button,these controls should be added in the detailsview above the row of edit/update/cancel button.when i select the dropdownlist,the selected items should be displayed in the label text.For example,

Label TextBox DropDownList