An addition to @Oded, you can make the method Generic aswell:
public T ConvertXml<T>(string xml)
{
var serializer = new XmlSerializer(typeof(T));
return (T)serializer.Deserialize(new StringReader(xml));
}
This way you don’t need to make the whole class generic and you can use it like this:
var result = ConvertXml<MyObject>(source);