Gets or sets the collection of security certificates that are associated with this request.
Assembly: System (in System.dll)
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.
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 (if there is one), or tries to reuse an anonymous sessions if is empty.
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 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.