Losing binding when updating datasource

For the example below:

timebindings(1) is as bindingsource

and timebindings(1).datasource = s1values(1)

I have a label with a binding as such:  label14.databinding.add("Text", timebindings(1), "Timestamp")

s1values(1) and s1valueread(1) are both opc.da.itemvalueresult  objects

In the code below.  When I am debugging.  If I skip the first two lines and do an immediate execution

of  s1valueread(1).timestamp = "11/22/2013 10:00:00 AM"  then execute the resetbindings loop the label control will properly update.

The problem is when I execute the line s1valuesread = s1values to update the data source; then execute the resetbindings loop the label no longer updates.

If I look at the datasource for timebindings(1) during debug it clearly shows as not having changed.

Why does the link between the bindingsource and it's datasource seem to be lost when I set s1valueread = s1values?  It seems like I am missing something simple.

Thanks in advance for any assistance.

Private Sub refreshvalues()
        s1values = opcserver.Read(s1items)
        s1valueread = s1values

        For i As Integer = 0 To 7
            timebindings(i).ResetBindings(False)
        Next

    End Sub