Recode 1 form in visual basic classic vb6
Save on frmContacts needs coding
if a new contact that is not on the list(lstContacts)
then add it to the list
if Save is Not clicked when a new contact or editing a saved contact
then mIsDirty = true
prompt on form unload if dirty
eg: Save Changes ?
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As description in your requirement. I'm sure to complete this tool for you. inbox me if you have any question about my skill or this project. Thank for your attention HuyPQ.