public override string[] FindUsersInRole(string roleName, string usernameToMatch)
{
if (!RoleExists(roleName))
throw new ProviderException("Specified role not found");
var logins = new SecurityRepository().GetLoginsAssignedToRole(roleName);
if (!string.IsNullOrEmpty(usernameToMatch))
logins = logins.Where(v => v.Contains(usernameToMatch));
return logins.OrderBy(v => v).ToArray();
}