There is no correspondance of fieldNum to datatable column as not all columns in a datatable have to be columns in the grid. If you want to access a particular column in the DataTable, then you should use the MappingName property of the GridBoundColumnt to access it.
Dim colIndex as integer = Me.GridDataBoundGrid1.Selections.Ranges.Item(0).Left
Dim FieldIndex as integer = Me.GridDataBoundGrid1.Binder.ColIndexToField(colIndex)
Dim colName as String = Me.GridDataBoundGrid1.Binder.InternalColumns(FieldIndex).MappingName
'' dv.table.columns(colName)
You actually get better support through our Direct Trac support system which also offers a nonpublic support venue. You don't not have to post questions in this forum unless you want to do so.
We are working to improve the reference material made available with the product.