rdlc - How to add up row totals in report viewer -

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i'm new reporting , jargon goes try draw insted of write it.

|         |     |   b   |   c   |   d   |   e   | ------------------------------------------------- | apples  |   1   |   3   |   6   |   2   |  12   | ------------------------------------------------- | oranges |   3   |   2   |   4   |   1   |  10   | ------------------------------------------------- | bananas |   5   |   3   |       |   1   |   9   | ------------------------------------------------- |         |       |       |       |       |  31   |

i need sum last column e indicated 31. cells values 12,10,9 obtained =sum(fields!a.value + fields!b.value + fields!c.value + fields!d.value).

i can't change sql query and/or dataset used. 1 have suggestion? thanks!

edit: i've added function code

public total_lookup_sum integer = 0   public function lookup_sum(byval value integer) integer    total_lookup_sum = total_lookup_sum + value         return total_lookup_sum   end function

and calling code.equals(reportitems!txtfruittotal.value) false.

with of colleague answer reached:

sum(fields!a.value) + sum(fields!b.value)  + sum(fields!c.value) + sum(fields!d.value)

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