how to show and add all footer values in different page on last page in grid view while using paging

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VB

ASP.NET

Hi I have taken gridview which shows the total of all rows in particular column in footer and
I also used paging for this gridviw ,there are 4 pages in grieview.Now I have to take all four footer values on a seperate page and then i have to take addition of that value to calculate grant total.
So please can you suggest me how to take all 4 footer values on last page.

1 A 2
2 B 3
3 C 4
Total 9

1 A 4
2 B 4
3 C 4
Total 12

then in result it should be like this

Total1 9
total2 12
Grant Total 21



Thanking You....