Use NumberStyles parameter in Parse and TryParse

When you want to parse string to int which contains various style or format, such as currency symbol, thousands separator, etc., use TryParse(String, NumberStyles, IFormatProvider, Int32). See more:

Int32.TryParse Method (String, NumberStyles, IFormatProvider, Int32)

http://msdn.microsoft.com/en-us/library/zf50za27.aspx