Static member cannot be accessed with an instance reference; qualify it with a type name instead

Hi,

I've got this error: Static member 'System.Text.RegularExpressions.Regex.IsMatch(string, string)' cannot be accessed with an instance reference; qualify it with a type name instead

I really can't find what's going wrong. Another solution on EE gives an answer: use classname, but that's what I do. (const.InvalidAlbumPattern). Still the error occurs...


below a code snippet:
public sealed class FileManager
    {
        private class Consts
        { ...
                        public const string InvalidAlbumPattern = "[\\\\/:*?\"<>|]";
          ...
        }

        public static bool IsValidAlbumName(string name)
        {
            Regex reg;
            if (reg.IsMatch(name, Consts.InvalidAlbumPattern)) <<<<<--------- HERE'S THE ERROR
            {
                return false;
             }
         ...
         }
     }

Thanks in advance
kGenius