using System;
using System.Globalization;
public class Example
{
public static void Main()
{
double value = 12345.6789;
Console.WriteLine(value.ToString("E", CultureInfo.InvariantCulture));
Console.WriteLine(value.ToString("E10", CultureInfo.InvariantCulture));
Console.WriteLine(value.ToString("e4", CultureInfo.InvariantCulture));
Console.WriteLine(value.ToString("E", CultureInfo.CreateSpecificCulture("fr-FR")));
}
}
/*
1.234568E+004
1.2345678900E+004
1.2346e+004
1,234568E+004
*/