SSRS code variable resetting on new page - reporting-services

Question

In SSRS 2008 I am trying to maintain a SUM of SUMs on a group using custom Code. The reason is that I have a table of data, grouped and returning SUMs of the data. I have a filter on the group to remove lines where group sums are zero. Everything works except I'm running into problems with the group totals - it should be summing the visible group totals but is instead summing the entire dataset. There's tons of articles about how to work around this, usually using custom code. I've made custom functions and variables to maintain a counter:
Public Dim GroupMedTotal as Integer
Public Dim GrandMedTotal as Integer
Public Function CalcMedTotal(ThisValue as Integer) as Integer
GroupMedTotal = GroupMedTotal + ThisValue
GrandMedTotal = GrandMedTotal + ThisValue
Return ThisValue
End Function
Public Function ReturnMedSubtotal() as Integer
Dim ThisValue as Integer = GroupMedTotal
GroupMedTotal = 0
Return ThisValue
End Function
Basically CalcMedTotal is fed a SUM of a group, and maintains a running total of that sum. Then in the group total line I output ReturnMedSubtotal which is supposed to give me the accumulated total and reset it for the next group. This actually works great, EXCEPT - it is resetting the GroupMedTotal value on each page break. I don't have page breaks explicitly set, it's just the natural break in the SSRS viewer. And if I export the results to Excel everything works and looks correctly.
If I output Code.GroupMedTotal on each group row, I see it count correctly, and then if a group spans multiple pages on the next page GroupMedTotal is reset and begins counting from zero again.
Any help in what's going on or how to work around this? Thanks!

Answer 1

Finally found the solution myself. Here it is, add Shared to the variable declarations:
Public Shared Dim GroupMedTotal as Integer
Public Shared Dim GrandMedTotal as Integer

Answer 2

Just changing the variables to shared won't work. If you set them to shared they'll be DOUBLED when you export to PDF / XLS / etc (because it just kept adding to the existing var). You have to do something like this:
Public Shared Dim grandTotal as Decimal
Public Shared Dim costCenterTotal as Decimal
Public Shared Dim workerTotal as Decimal
Public Shared Function Initialize()
grandTotal = 0
costCenterTotal = 0
workerTotal = 0
End Function
Public Function AddTotal(ByVal b AS Decimal) AS Decimal
grandTotal = grandTotal + b
costCenterTotal = costCenterTotal + b
workerTotal = workerTotal + b
return b
End Function
Public Function GetWorkerTotal()
Dim ret as Decimal = workerTotal
workerTotal = 0
return ret
End Function
Public Function GetCostCenterTotal()
Dim ret as Decimal = costCenterTotal
costCenterTotal = 0
return ret
End Function
Public Function GetGrandTotal()
Dim ret as Decimal = grandTotal
grandTotal= 0
return ret
End Function

Answer 3

I don't know where do you use this. but in your case, if I were you, I just use simple expression to check visibility of SUM
for example I'd use Right Click On Sum Box \ Select Expression \ then use IIF(SUM <> 0, sum. "")
It worked on every where and wont reset, in your case you have a Region and your code will reset in every region so you willface with serios isses if you don't change your way.