Grid view select operation to update data from form view

I am trying this from many days with no success,
User first fills the registration form and after clicking submit, all JavaScript validations should fire (no field should be blank and all fields should meet criteria) and after that,all details must be saved in database (SQL)server( created table in database) and grid view must be displayed.
1. In grid view, there must be two links (select and delete) starting of every row and also one addnew button on top of the grid view.
2. when clicked on addnew button, it should display only registration form with all empty fields and submit&reset buttons(Grid view should not be visible here, only form).
3. when clicked on select link, the selected row details must appear in registration form with corresponding field values inside text boxes and after modifying those details and clicked on update button( update button must be visible below registration form only) , details must bt updated to data base.

Validation part is completed and delete also working fine.

Can any one help me with remaining query?