X509Certificate.GetSerialNumber Method

Definition

Returns the serial number of the X.509v3 certificate as an array of bytes in little-endian order.

C#
public virtual byte[] GetSerialNumber();

Returns

Byte[]

The serial number of the X.509 certificate as an array of bytes in little-endian order.

Exceptions

The certificate context is invalid.

Examples

The following example uses the GetSerialNumber method to return a certificate's serial number as an array of bytes and displays it to the console.

C#

using System;
using System.Security.Cryptography.X509Certificates;

public class X509
{

    public static void Main()
    {

        // The path to the certificate.
        string Certificate =  "Certificate.cer";

        // Load the certificate into an X509Certificate object.
        X509Certificate cert = X509Certificate.CreateFromCertFile(Certificate);

        // Get the value.
        byte[] results = cert.GetSerialNumber();

        // Display the value to the console.
        foreach(byte b in results)
        {
            Console.Write(b);
        }
    }
}

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.6, 2.0, 2.1