ASP.Net Membership Provider Class In Custom Method Creating

Question

There is a method in ASP.Net Membership Provider class which is 

public static bool ValidateUser(string username, string Password);

 So now I want  to create a custom method of ValidateUser with username and email parameter like mensioned below. 

public static bool ValidateUser(string username, string email);

So , please anyone can tell me how do i create this?