This is similar to "Oracle Nasty Dates Finder for .NET folks!" but this time it is for numbers instead of dates! I ran into this issue as I was moving data from Oracle to SQL Server. So, you are working with Oracle using ODP.NET and you have a simple, straight-forward SELECT * FROM TABLE; Alternatively, … Continue reading Oracle ODP.NET: Resolve “Arithmetic operation resulted in an overflow” or “Specified cast is not valid”