The below always results in an empty table, when I know the Gridview
has rows.

Dim dataTable As DataTable = CType(ChargeGridView.DataSource,
DataTable)
        If Not (dataTable Is Nothing) Then   '****** (THIS IS ALWAYS
FALSE) ****

Is there a correct way to do this?

I think you should try to display the dataTable of the dataSet that you
originally set the ChargeGridView.DataSource to

say

Dim ds as DataSet
'Fill ds with data
ChargeGridView.DataSource = ds

'now you can access the data in the ds
Dim dataTable As DataTable = ds.tables(0)


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