Data binding is all about declarative code, right? So I specify what I want with attributes, and the framework takes care of the rest. Unless I\'m mistaken and data bindin
I don't know if it will really help you, but did you tried to setup the "SelectedValue" on Code behind?
Example:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
DropDownInfoSource.SelectedValue = "1" ' your value, here
End Sub