Extensions sample

//Extensions examples

public static class LegacyExtensions
{
        public static string ToLegacyFormat(this DateTime dateTime)
        {
            return dateTime.Year > 1930 ? dateTime.ToString("1yyMMdd") :
                dateTime.ToString("0yyMMdd");
        }


        public static string ToLegacyFormat(this string name)
        {
            var parts = name.ToUpper().Split(' ');
            return parts[1] + ", " + parts[0];
        }
}

//Xml converter
using System.Xml;
public static class DateTimeExtensions
{
     public static string ToXmlDateTime(this DateTime dateTime)
     {
        eturn XmlConvert.ToString(dateTime, XmlDateTimeSerializationMode.Utc);
     }
}



//Test sample

    [TestClass]
    public class LegacyExtensionsTests
    {
        [TestMethod]
        public void ToLegacyFormat_C20()
        {
            //Arrange
            //Act
            //Assert
            var dateTime = new DateTime(1920, 12, 31);
            Assert.AreEqual("0201231", dateTime.ToLegacyFormat());
        }

        [TestMethod]
        public void ToLegacyFormat_C21()
        {
            var dateTime = new DateTime(2013, 10, 31);
            Assert.AreEqual("1131031", dateTime.ToLegacyFormat());

        }

        [TestMethod]
        public void ToLegacyName()
        {
            var name = "Elton Stoneman";
            Assert.AreEqual("STONEMAN, ELTON", name.ToLegacyFormat());
        }