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...).
Protected Sub btnSetRating_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSetRating.Click Dim cRating As Rating = New Rating Dim dMatchDate As DateTime Dim sType As String Dim iSetID As Integer Dim iHPlayerID As Integer Dim iAPlayerID As Integer Dim iHTableRun As Byte Dim iATableRun As Byte Dim iH8Break As Byte Dim iA8Break As Byte D ...