I would do this in the save method of your control or form. Do you use classes? Is there a parent class? Do you have a beforesave() and aftersave() or something similar? Is each field saved as the user moves through a field or is there a save button? Is it local tables or sqlserver backend? Store the current value using a property of the control and then check it when the control loses focuses against the current value (or right after your save, etc) or check each field against it original value right after a save (if done using a button, etc)...

*--Say you make a property to each control origvalue and load it
IF THIS.origvalue <> this.value
   && Save your changes then
   && store the record of changes made to the memo field
   && then:
   THIS.origvalue = this.value && so next time going through it checks
ENDIF

>I need to check to see if a value has changed on a form and if it has, record this by placing the before and after values into a memo field in the same table, along with the User's name and date/time the change was made; is there a simple way to do this?