Inside Visual Studio 2008 
by Dino Esposito

Listing One

namespace Samples
{
    public static class StringExtensions
    {
        public static bool IsInt32(this string content)
        {
            int number;
            bool result = Int32.TryParse(content, out number);
            return result;
        }
        public static bool IsDate(this string content)
        {
            DateTime ...