Advice on editable datagrid

Hi,

Could you help me to understand how datagrid works.
I'm trying to make a datagrid editable. Now most of the tutorials I read says that i should turn the Enable ViewState off. Why is that?

If i turn this off then i need to support building the datagrid because the datagrid is not persistant.
Right?

If i put the EnableViewState off then i don't get any call to:
protected override void LoadViewState(object savedState).
Right?

If i put EnableViewState on then i get calls to this function but if i rebuild the datagrid in this function then is it still not recommended to have EnableViewState?

If i don't have the EnableViewState and have an editable datagrid and in the Page_Load function i have the recommended:
if (!Page.IsPostBack)
and in the if clause i have a function call to build the datagrid. Ok

If i click on the edit button in the datagrid then i will not get any events to EditCommand because the IsPostBack is true and no datagrid was built.
Right?

Please leave some comments/suggestions on this

Yours sincerely
Andla