using System;

using System.Text;

using System.Globalization;

​

public class Program

{

    public static void Main(string[] args)

    {

        var sb = new StringBuilder("Random text");

        var sb2 = new StringBuilder("More random text", 256);

        Console.WriteLine("Capactiy: {0}", sb2.Capacity);

        Console.WriteLine("Length: {0}", sb2.Length);

        sb2.AppendLine("\nMore important text");

        CultureInfo enUS = CultureInfo.CreateSpecificCulture("en-US");

        string bestCustomer = "John Doe";

        sb2.AppendFormat(enUS, "Best Customer: {0}", bestCustomer);

    }

}