using System;

public class Program

{

    public static void Main()

    {   

        double testVar = 3571094.111;

        var res = testVar.ToString("N2");

        Console.WriteLine(res);

        var res1 = string.Format("{0:#,0.00}",testVar);

        Console.WriteLine(res1);

        var res2 = Math.Round(testVar);

        Console.WriteLine(res2);

        var res3 = Math.Round(testVar,2);

        Console.WriteLine(res3);

    }

}