How to serialize/deserialize simple classes to XML and back

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XmlSerializer is one way to do it. DataContractSerializer is another. Example with XmlSerializer:

using System.Xml;
using System.Xml.Serialization;

//...

ShoppingCart shoppingCart = FetchShoppingCartFromSomewhere();
var serializer = new XmlSerializer(shoppingCart.GetType());
using (var writer = XmlWriter.Create("shoppingcart.xml"))
{
    serializer.Serialize(writer, shoppingCart);
}

and to deserialize it back:

var serializer = new XmlSerializer(typeof(ShoppingCart));
using (var reader = XmlReader.Create("shoppingcart.xml"))
{
    var shoppingCart = (ShoppingCart)serializer.Deserialize(reader);
}

Also for better encapsulation I would recommend you using properties instead of fields in your CartItem class.

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