Well...that depends.
How did you add the items to the list?
What exactly do you mean by "edit the items in the DropDownList"?
Do you want the user to be able to edit them?
The DropDownList in ASP.NET is not exactly the same thing as a ComboBox in a Windows Forms (desktop) application. You can't just "edit" an item. You'll have to provide the user with things like a TextBox and a Button to let them edit something.
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