Security :: Split The String Of MembershipCreateStatus To Multi-word?

I hope to convert MembershipCreateStatus to a string, but I hope to split the string to multi-word by upper case, such as "InvalidUserName"=>"Invalid User Name", how can I do?

Now I use a complex way.

MembershipCreateStatus status;
Membership.CreateUser(userName, password, email, question, answer, true, out status);
string s="";
switch (status)
{
case MembershipCreateStatus.Success:
s="Success"
break;
case MembershipCreateStatus.DuplicateUserName:
s="Duplicate User Name"
break;
case MembershipCreateStatus.InvalidUserName:
s="Invalid User Name"
break;
case MembershipCreateStatus.DuplicateEmail:
s="Invalid User Name"
break;
}