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HttpWebRequest.ClientCertificates Property

Gets or sets the collection of security certificates that are associated with this request.

Namespace:  System.Net
Assembly:  System (in System.dll)

public X509CertificateCollection ClientCertificates { get; set; }

Property Value

Type: System.Security.Cryptography.X509Certificates.X509CertificateCollection
The X509CertificateCollection that contains the security certificates associated with this request.

ExceptionCondition
ArgumentNullException

The value specified for a set operation is null.

An application can add a certificate to a collection, but might not have access rights to it. To use a certificate contained in the collection, the application must have the same access rights as the entity that issued the certificate.

NoteNote:

The Framework caches SSL sessions as they are created and attempts to reuse a cached session for a new request, if possible. When attempting to reuse an SSL session, the Framework uses the first element of ClientCertificates (if there is one), or tries to reuse an anonymous sessions if ClientCertificates is empty.

NoteNote:

For performance reasons, you shouldn't add a client certificate to a HttpWebRequest unless you know the server will ask for it.

For a code example illustrating how to enumerate the certificates in the client certificate store, see the X509Certificate2Collection class.

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition Platform Note: The Framework attempts to reuse an SSL session only if a client certificate is not required.

Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows CE Platform Note: Only the first client certificate from the client certificate collection will be sent during the client authentication phase, regardless of the list of trusted CAs from the server. This limitation will be corrected in a future release of the .NET Compact Framework.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5

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