how to select with DropDownList.text

I am working on an Asp.NET project and I am trying to set the selected value of a dropdown list with a text property. For example i have i.e an item in the dropdown list with text test. Programmatically can i set it to selecteditem by Text?. I am using the follwing code but is not working.

Nested Repeaters in C#

Hi I have to display hierarchical information (which has four levels) within a repeater. For this I decided to use the nested repeater control.
I found this article on MSDN, http://support.microsoft.com/kb/306154 which shows how to use nested repeaters for two levels of information.
Can someone please help me extend this to four levels?
A sample code would be much appriciated. Thank you.