SSRS Running Totals Custom Code

I have a report in which I need to total a column with an expression and created simple code to have a running total.  When I run the report through report builder, the total only reflects the current page (it is 6 pages long) but if I export the report
out to Excel, the total is correct.
Below is the code:
Public running_roy as Double = 0
Public Function roy_tot(ByVal cust_type, ByVal roy, ByVal ret_value) as Double
Dim temp_var as Double
if cust_type = 0 then
running_roy = running_roy + roy
if ret_value = 0 then
temp_var = roy
else
temp_var = running_roy
end if
ELSE
temp_var = 0
end if
return temp_var
End Function
If I change the Public variable to "Public Shared" the totals change as I flip back and forth between the pages in report builder.
Any suggestions?

Hello alan2624,
Thanks for your clarification.
In the report, the custom code will be compiled as a class before it is used. Every time the page is loaded, the class on the page will be initialized. The un-shared (non-static) instance will be reset. Therefore, you will see the value is reset back to
zero if the public variable is not announced as "Shared". If you announced it as shared, then the variable is on the class level. It will not be changed by instance initializing. In addition, any operations on the variable will be recorded. This is not the
bug, but it is by design of the VB.net code.
If you export the report to the Excel, I think it will only generate a single page, and the total value is only the last one. It should be correct. If it is used in the pages in browser, I suggest you need design your code carefully for VB.net design.
If you have any questions about this issue, please let me know.
Regards,
Edward
Edward Zhu
TechNet Community Support

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