using System;

public class Program

{

    public static void Main()

    {

        decimal decimalParse = decimal.Parse("1.13687e-13", System.Globalization.NumberStyles.Number | System.Globalization.NumberStyles.AllowExponent);

        decimal convertParse = Convert.ToDecimal(".5");

        Console.WriteLine("decimalParse:{0}, convertParse:{1}", decimalParse, convertParse);

    }

}