<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Security.Cryptography.X509Certificates.X500DistinguishedNameFlags

namespace System.Security.Cryptography.X509Certificates { public enum X500DistinguishedNameFlags { DoNotUsePlusSign = 32, DoNotUseQuotes = 64, ForceUTF8Encoding = 16384, None = 0, Reversed = 1, UseCommas = 128, UseNewLines = 256, UseSemicolons = 16, UseT61Encoding = 8192, UseUTF8Encoding = 4096 } }