Update button in gridview delete row!

Question

Hi

I have GridView2 that is template field of GridView1. I checked "auto generate  INSERT UPDATE and DELETE statements" but I don't use delete button. Now after I click EDIT and change something in cells I click Update button row is DELETE instead  UPDATE.
 

Any suggestions?

 Now I fix my problem. I select  "Use optimistic concurrency" and now everything works fin but I still don't now what was a problem!!!