System.InvalidCastException: Conversion from string "" to type 'Integer' is not valid. ---> System.FormatException: Input string was not in a correct format.
at Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat)
at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value)
--- End of inner exception stack trace ---
at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value)
at Product.Refresh(Boolean blnBind)