String C# Tutorial

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class MainClass
{
    public static void Main()
    {
        StringBuilder sb = new StringBuilder("Foo");
        sb.AppendFormat("...{0}", DateTime.Now);
        string final = sb.ToString();
        Console.WriteLine(final);
    }
}
Foo...25/03/2007 3:03:25 PM