Jeff,

>I placed the data in an MM object (oWorkStations) and set the datagridview ColumnType to DataGridViewComboBoxColumn. Since I can't change the DataSource in the EditColumns form, I used the following code:
>
> DataGridViewComboBoxColumn dgvcc =
> (DataGridViewComboBoxColumn)dgvParents.Columns["colParentFK"];
> dgvcc.DataSource = "WorkStations";
> dgvcc.ValueMember = "WorkStationPK";
> dgvcc.DisplayMember = "ComputerName";

It looks like you are setting the DataSource to a string here? If so, you need to set it to a DataTable reference instead. For example:

dgvcc.DataSource = MyDataSet.Tables["WorkStations"];

Best Regards,