Question

I receive FormatException and I don’t know why.

System.FormatException was unhandled by user code
  Message=Input string was not in a correct format.
  Source=mscorlib
  StackTrace:
       at System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt)
       at System.Convert.ToDouble(String value)

line of code:

DELTA_BUY = Convert.ToDouble(parameters["DELTA_BUY"]);

value (from debug window):

parameters["DELTA_BUY"] "0.0016"    string

upd works fine on one execution path but fails on another execution pass (when came from WCF). reproducable on double, works fine with strings. probably format/nationalization issue?

Answer 1

Is your machine perhaps set to a Culture where “0.0016” is not a valid number?
Try

DELTA_BUY = Convert.ToDouble(parameters["DELTA_BUY"], System.Globalization.CultureInfo.InvariantCulture);