Data Types C#

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using System;
using System.Globalization;
public class Example
{
   public static void Main()
   {
        double number;
        
        number = 12345.6789;      
        Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture));
        Console.WriteLine(number.ToString("G", CultureInfo.CreateSpecificCulture("fr-FR")));
        Console.WriteLine(number.ToString("G7", CultureInfo.InvariantCulture));
        
        
        number = .0000023;
        Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture));
        Console.WriteLine(number.ToString("G", CultureInfo.CreateSpecificCulture("fr-FR")));
        
        
        number = .0023;
        Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture));
        
        number = 1234;
        Console.WriteLine(number.ToString("G2", CultureInfo.InvariantCulture));
        
        number = Math.PI;
        Console.WriteLine(number.ToString("G5", CultureInfo.InvariantCulture));
   }
}
/*
12345.6789
12345,6789
12345.68
2.3E-06
2,3E-06
0.0023
1.2E+03
3.1416
*/