Note: This class is new in the .NET Framework version 2.0.
Defines the usage of a key contained within an X.509 certificate. This class cannot be inherited.
Namespace: System.Security.Cryptography.X509Certificates Assembly: System (in system.dll)
The following code example demonstrates how to open a user’s personal certificate store and display information about each certificate in the store. This example uses the X509KeyUsageExtension class to display the information.