Possible to use Count(*) filtering a dataView?

I have loaded a dataview with data from a datatable. I need to find a way to query the dataview and count the number of records returned from the filter and bind the count value to a label. Is it possible to filter a dataview this way?

VB Code:

Dim dv As New DataView(ds.Tables(0))
        dv.RowFilter = "QualifiedName = '" & trvDatabase.SelectedNode.Text & "'"
        lblConnString.Text = dv.Count.ToString

Thanks