Winforms Datagrid multiselect sort problem

[Tom Hughes]

I want to change one field of all selected rows to a provided value.

Problem 1
I am using the Binding Manager Base to bind the datagrid to the
appropriate dataTable as recommended by KB817247.
It works in all cases but one. If the field being changed is also one
the user has selected as a sort column, then all but the first
selections are missed. If I remove the sort from that column before
or after

binding with the Binding Manager Base, all selections are lost. Am I
wrong in assuming that once bound, I can use the index from the
bindingManager within the dataGrid? If so, how do I associate

mulit-selected rows with data when sorting is used?

Problem 2
If I use the Binding Manager to iterate through the rows to determine
which is selected, Datagrid.getChanges (modified) returns with all
rows modified.

Problem 3
Using the Binding Manager to iterate through the rows, causes each row
to be selected within DataGrid, so user sees scroll effect.
Minor but annoying.

Code Sample:
//dgVirtualDevices is a DataGrid
DataView workTableView = workTable.DefaultView;
dgVirtualDevices.DataSource = workTableView;

string name = frmNewSource.ReturnText;
BindingManagerBase bm = BindingContext[this.workTableView];
for(bm.Position = 0; bm.Position < bm.Count-1; bm.Position++)
{
if(dgVirtualDevices.IsSelected(bm.Position))
{
DataRowView selected = (DataRowView)bm.Current;
//if new name is different than old name
if (selected[sourceColName].ToString() != name)
{
//change name and select to update historical data
selected[updatedSourceColName] = name;
selected[updateHistoricalColName] = true;
selected.EndEdit();
}
}
}
I appreciate any insight on this.

Thanks

Tom Hughes