Gridview row update/insert from textbox when edit button is clicked

[bravejava]

I have two panels.In panel1 i have a registration formlike username,password,email,city,state,zipand in panel2 I have gridview.I am inserting the data into sql server database from the registration form and I am binding the data to gridview.when edit button click in the gridview I am hiding the panel2 that is gridview and I am getting the values from gridview to textboxes in the registration form.When I am modifying the data in the registration form and when button is clicked the data is not updated in the gridview row,as well as new row is adding in the database and it is binding to the gridviewhelp me how to do this task