ASP.Net User forgot answer to password question
var provider = Membership.Providers["AspNetSqlMembershipProviderAdministrativeReset"] as MembershipProvider;
var newPassword = provider.ResetPassword(userName, null /* answer */);

// Assume user name is 'theuser'.  Obviously you would get this beforehand
MembershipUser user = Membership.GetUser("theuser");
string newPassword = user.ResetPassword();