We can add running total in the report(rdlc) easily using variable but what if we have to add that running total in the page? have you ever tried? if not then let's try now.
In my case i have totaled for Debit and Credit Amount field of "General ledger entries" first i tried to add total using flowfield but it did not work so after that i have decided to running total with the help of code.
So here is code of Running Total.