DataGridViewComboBoxColumn / DisplayMember / ValueMember

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C#

I don't understand why this is so difficult. I've never posted a C# question but I can't seem to figure out the use of DataGridViewComboBoxColumn with DisplayMember and ValueMember.

Any help would be greatly appreciated:

DataGridViewComboBoxColumn cbCol = new DataGridViewComboBoxColumn();
cbCol.DefaultCellStyle.NullValue = "--Select--"; 
cbCol.FlatStyle = FlatStyle.Popup;
cbCol.DataSource = new functions_sqls().select("select distinct l.list_value vm, l.long_description dm from lists l");
cbCol.DisplayMember = "dm";
cbCol.ValueMember = "vm";    
cbCol.Name = Col.ToString();
dgv1.Columns.Add(cbCol);

Thanks,
Scott