Class inheritance issue with XmlNodeList

Question

Hello, I am attempting to create a custom class that is inherited from XmlNodeList. public class MyNLClass : XmlNodeList { public string MyFunction(string name) { } } I would like to add a few additional functions. when I create class, I am getting errors like: MyNLClass' does not implement inherited abstract member 'System.Xml.XmlNodeList.Count.get' MyNLClass' does not implement inherited abstract member 'System.Xml.XmlNodeList.GetEnumerator()' MyNLClass' does not implement inherited abstract member 'System.Xml.XmlNodeList.Item(int)' Any help would be appreciated. Thanks