fCraft.Chat.ContainsInvalidChars C# (CSharp) Method

        public static bool ContainsInvalidChars( string message ) {
            return message.Any( t => t < ' ' || t == '&' || t > '~' );
        }

 public static bool IsValidPrefix([NotNull] string prefix)
 {
     if (prefix == null)
     {
         throw new ArgumentNullException("prefix");
     }
     if (prefix.Length == 0)
     {
         return(true);
     }
     if (prefix.Length > 1)
     {
         return(false);
     }
     return(!Chat.ContainsInvalidChars(prefix));
 }