This is all very confusing, but I'm trying.

I am using strongly typed datasets, that I simply drag on to the form.

I have a dataset created here:
Me.PODetailTableAdapter.Fill(Me.PODataSet.PODetail)

Its there, because I have a datagridview that uses it. Now I want to
take all the detail lines and write them to another table.

now how do I access this data.  I come from the fox world and am used
to working with cursors.  

I tried this:
For i = 1 To Me.POtDataSet.Tables("PODetail").Rows.Count - 1
 MsgBox(Me.PODataSet.Tables("PODetail").Rows(i).Item("Item_Nr"))
Next

but that gives me ALL the data from the backend.  I want the data that
I have currently loaded on the form.

I do know how to create a dataReader and loop thru it, but I figure
since the data is already loaded on the form, I don't want to keep
reloading redundant data.

Some day soon, something will click and I will understand all this.

Thanks for your help