Hashtable serializers = new Hashtable();

// Use the constructor that takes a type and XmlRootAttribute.

XmlSerializer s = new XmlSerializer(typeof(MyClass), myRoot);

// Implement a method named GenerateKey that creates unique keys

// for each instance of the XmlSerializer. The code should take

// into account all parameters passed to the XmlSerializer

// constructor.

object key = GenerateKey(typeof(MyClass), myRoot);

// Check the local cache for a matching serializer.

XmlSerializer ser = (XmlSerializer)serializers[key];

if (ser == null)

{

    ser = new XmlSerializer(typeof(MyClass), myRoot);

    // Cache the serializer.

    serializers[key] = ser;

}

else

{

    // Use the serializer to serialize, or deserialize.

}