[This post have been modified]
Hello ad_flying
have you tried with the DetailsView.PageIndex Property? Be advice that Paging in the DetailsView control should be enabled.
If you set the AutoPostBack to true in the DropDownList, handling the SelectedIndexChanged event you could try to use:
Public myDDL_SelectedIndexChanged(sender as Object, e as EventArgs) _
Handles myDDL_SelectedIndexChanged
myDetailsView.PageIndex = myddl.SelectedIndex
End Sub
I haven't test this code by myself, hence I don't know if it will work.
VB .Net Coder - Apologize my C# nescience
Best Regards.