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X509Certificate2.Version Property

Gets the X.509 format version of a certificate.

Namespace:  System.Security.Cryptography.X509Certificates
Assembly:  System (in System.dll)

public int Version { get; }

Property Value

Type: System.Int32
The certificate format.

ExceptionCondition
CryptographicException

The certificate is unreadable.

There are several versions of X.509 certificates. This property identifies which format the certificate uses. For example, "3" is returned for a version 3 certificate.

The following code example creates a command-line executable that takes a certificate file as an argument and prints various certificate properties to the console.


using System;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.IO;
using System.Security.Cryptography.X509Certificates;


class CertInfo
{
	//Reads a file.
	internal static byte[] ReadFile (string fileName)
	{
		FileStream f = new FileStream(fileName, FileMode.Open, FileAccess.Read);
		int size = (int)f.Length;
		byte[] data = new byte[size];
		size = f.Read(data, 0, size);
		f.Close();
		return data;
	}
	//Main method begins here.
	static void Main(string[] args)
	{
		//Test for correct number of arguments.
		if (args.Length < 1)
		{
			Console.WriteLine("Usage: CertInfo <filename>");
			return;
		}
		try
		{
			X509Certificate2 x509 = new X509Certificate2();
			//Create X509Certificate2 object from .cer file.
			byte[] rawData = ReadFile(args[0]);

			x509.Import(rawData);

			//Print to console information contained in the certificate.
			Console.WriteLine("{0}Subject: {1}{0}", Environment.NewLine,x509.Subject);
			Console.WriteLine("{0}Issuer: {1}{0}", Environment.NewLine,x509.Issuer);
			Console.WriteLine("{0}Version: {1}{0}", Environment.NewLine,x509.Version);
			Console.WriteLine("{0}Valid Date: {1}{0}", Environment.NewLine,x509.NotBefore);
			Console.WriteLine("{0}Expiry Date: {1}{0}", Environment.NewLine,x509.NotAfter);
			Console.WriteLine("{0}Thumbprint: {1}{0}", Environment.NewLine,x509.Thumbprint);
			Console.WriteLine("{0}Serial Number: {1}{0}", Environment.NewLine,x509.SerialNumber);
			Console.WriteLine("{0}Friendly Name: {1}{0}", 								Environment.NewLine,x509.PublicKey.Oid.FriendlyName);
			Console.WriteLine("{0}Public Key Format: {1}{0}", 											Environment.NewLine,x509.PublicKey.EncodedKeyValue.Format(true));
			Console.WriteLine("{0}Raw Data Length: {1}{0}", Environment.NewLine,x509.RawData.Length);
			Console.WriteLine("{0}Certificate to string: {1}{0}", Environment.NewLine,x509.ToString(true));

			Console.WriteLine("{0}Certificate to XML String: {1}{0}", 								Environment.NewLine,x509.PublicKey.Key.ToXmlString(false));

			//Add the certificate to a X509Store.
			X509Store store = new X509Store();
			store.Open(OpenFlags.MaxAllowed);
			store.Add(x509);
			store.Close();
		}

		catch (DirectoryNotFoundException)
			{
				   Console.WriteLine("Error: The directory specified could not be found.");
			}
		catch (IOException)
			{
				Console.WriteLine("Error: A file in the directory could not be accessed.");
			}
		catch (NullReferenceException)
			{
				Console.WriteLine("File must be a .cer file. Program does not have access to that type of file.");
			}
	}

}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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