Let say i have a field called Status
when you create a record, the status is "Intern"
so txtStatus.text="Intern"
I have Update button, it will open combo box Status with prefileed statutes :
Intern
Part Time
Full Time
so you have the ability to select something from the combo box and update the status, from Intern to Part Time or what ever...
But the original status should be preselected in combobox