How to do bulk insert,update,delete in gridview

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Gridview

Dear Sir

I got a scenario.There will be a gridview.

There is a edit button,this is outside the gridview.

after clicking edit button all the controls in gridview should be enabled,we can edit already existing records.By clicking add new button (outside gridview) one new row will be added.after clicking save button all the records including newly added rows will be saved.This save button is outside gridview

Only after clicking edit,add new button will be enabled.

For deletion each row inside gridview will have delete button ,after clicking delete button,that particular row should be deleted.

Please help me do this task

Thanks and Regards

N.Ramachandran