using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

          decimal value = Convert.ToDecimal(10.539);

          value = Math.Truncate(value * 100) / 100;

​

          Console.WriteLine( value.ToString("0.##", CultureInfo.InvariantCulture));

          Console.WriteLine(value.ToString("0.00", CultureInfo.InvariantCulture));

    }

}