Question about Inheritance

I am trying to inherit the membershipprovider class to create a custom membership provider
Here is what I coded:
Imports Microsoft.VisualBasic
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.Sql


Public Class rnzmemprovider
    Inherits MembershipProvider
However, I get a blue squiggly line under my class name.  When I hover over the blue line and says "Class must either
be either be declared "MustInherit" or override the following inherited 'MustOverride' members.
I don't understand this because every article I've read clearly states that the only thing you need to do is create the class and inherit.
See this link, as I was following the directions from this article on how to create a custom provider,
http://www.devx.com/asp/Article/29256/0/page/3
Why am I getting the squiggly blue line? 
Please help, I need to use a ...