hi John,
remember that your combobox is bound to a datatable, and each menu item
corresponds to a datarow.  you have access to the SelectedItem property,
which is an object, in your case it is a DataRowView because of the
databinding.   you can use the following code to access other items in the
datarow:
DataRowView dr = this.comboBox1.SelectedItem as DataRowView;
string whatever = dr["ColumnName"].ToString();

...

hope this helps

tim
blog: http://tim.mackey.ie