XmlConvert.ToString Method (Double)

using System;
using System.IO;
using System.Xml;

public class Sample
{
  public static void Main()
  {

    //Define the order data.  They will be converted to string  
    //before being written out.
    Int16 custID = 32632;
    String orderID = "367A54";
    DateTime orderDate = new DateTime();
    orderDate = DateTime.Now;
    Double price = 19.95;

    //Create a writer that outputs to the console.
    XmlTextWriter writer = new XmlTextWriter (Console.Out);
    writer.Formatting = Formatting.Indented;

    //Write an element (this one is the root)
    writer.WriteStartElement("order");

    //Write the order date.
    writer.WriteAttributeString("date", XmlConvert.ToString(orderDate, "yyyy-MM-dd"));

    //Write the order time.
    writer.WriteAttributeString("time", XmlConvert.ToString(orderDate, "HH:mm:ss"));

    //Write the order data.
    writer.WriteElementString("orderID", orderID);
    writer.WriteElementString("custID", XmlConvert.ToString(custID));
    writer.WriteElementString("price", XmlConvert.ToString(price));

    //Write the close tag for the root element
    writer.WriteEndElement();

    //Write the XML and close the writer
    writer.Close();  

  }

}