private static ValidationResult ValidateVersion(NuGetVersion version)
        {
            if (version.IsSemVer200())
            {
                return(new ValidationResult(string.Format(
                                                CultureInfo.CurrentCulture,
                                                CoreStrings.Manifest_InvalidVersionSemVer200,
                                                version.ToFullString())));
            }
            else if (!version.IsValidVersionForLegacyClients())
            {
                return(new ValidationResult(string.Format(
                                                CultureInfo.CurrentCulture,
                                                CoreStrings.Manifest_InvalidVersion,
                                                version)));
            }

            return(null);
        }