Web Forms :: Arithmetic Operation Resulted In An Overflow?

I do not understand how this problem happens, and I need help. The code below is very simple. It collects data entered into controls; instantiates a class; then sends the data to a class method for processing. No resulting value is returned to this code.You can see that there are no areithmetic operations performed on the data, but I sometimes get the error "arithmetic operation resulted in an overflow" right here on the last line cRating.SetRating(etc...).

[Code]....

The class method uses the player id values (single) for the two players (iHPlayerID and iAPlayerID) to find their rating values. Calculations are made and the database is updated.Observation 1:I don't want to discuss the class method too much because, and this is the odd part,the code behind breaks before reaching the class. I have inserted a breakpoint at the start of the class method and ran the code. The error occurrs and the class codenever appears.

Observation 2:I mentioned that the class uses the players' ID values to look-up their rating from the database and round that value (single) to an integer. The code works just fine if the integer values of the players and not the same. The code fails and gives the error every time if the integer values are the same. How can this happen if the class code never executes?