Hi,
Directly you can add values for Dropdown box. For that please follow below
steps.
1. Double click on Dropdown box. Properties window will be opened.
2. Select "Enter listbox entries manually".
3. Click on Add button below the radiobutttons.
Now you can add data whtever you want.
Or else you can do in another way.
You can use xml and put dataconnection inorder to get data from that xml.