[2005] gridview problems

[AeroConfident]

i have two problems while using gridview.
1st is i want to make a total amount in my gridview like this


how can i do that? i already stuck at that

the my 2nd problem is i want to edit my gridview like this





i already used the <asp:itemtemplate> n <asp:edititemtemplate> but still it won't work. so is something wrong in my code?

thx before