X509Certificate.X509Certificate(String, SecureString, X509KeyStorageFlags) Constructor

Initializes a new instance of the X509Certificate class using a certificate file name, a password, and a key storage flag.

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

public X509Certificate (
	string fileName,
	SecureString password,
	X509KeyStorageFlags keyStorageFlags
public X509Certificate (
	String fileName, 
	SecureString password, 
	X509KeyStorageFlags keyStorageFlags
public function X509Certificate (
	fileName : String, 
	password : SecureString, 
	keyStorageFlags : X509KeyStorageFlags
Not applicable.



The name of a certificate file.


The password required to access the X.509 certificate data.


One of the X509KeyStorageFlags values that controls where and how to import the private key.

Exception typeCondition


An error with the certificate occurs. For example:

  • The certificate file does not exist.

  • The certificate is invalid.

  • The certificate's password is incorrect.


The fileName parameter is a null reference (Nothing in Visual Basic).

If you create an X509Certificate certificate by specifying a PKCS7 signed file store for fileName, the X509Certificate is created for the certificate that signed the store rather than for any of the certificates within the store.

  • FileIOPermission  for permission to read the file described by the fileName parameter. Associated enumeration: Read Security action: Demand
  • KeyContainerPermission  for permission to create a key container. Associated enumeration: Create Security action: Demand

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0