Update Command Deletes Everything in the DetailView

[jrtcppv]

I have created a Detailed-view control that has few fields in it, some of the fields are bound fields and the rest I have converted them into template field. I have only enabled the Edit functionality. However, when I click the Edit button and make some changes and after that I hit the Update button, then everything will be wiped out or deleted except the field that I made the change. For instance, if I have:Last nameFirst nameAddressAnd I make changes in the address field, first name and last name fields will be erased and address only will be kept or saved. I am using a Query String to populate the DetailView. What am I doing wrong here? I can post my code if needed. thanks