Dim dv As System.Data.DataView = CType(SqlDataSource2.Select(DataSourceSelectArguments.Empty), System.Data.DataView)

Dim productQuery = From rowView As System.Data.DataRowView In dv _
Group rowView By category_name = (rowView.Row.Field(Of String)("category-name")) Into Total = Sum(rowView.Row.Field(Of Decimal)("countID")) _
Select category_name, Total