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X509Certificate Constructor (String, SecureString)

Initializes a new instance of the X509Certificate class using a certificate file name and a password.

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

public X509Certificate(
	string fileName,
	SecureString password
)

Parameters

fileName
Type: System.String

The name of a certificate file.

password
Type: System.Security.SecureString

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

ExceptionCondition
CryptographicException

An error with the certificate occurs. For example:

  • The certificate file does not exist.

  • The certificate is invalid.

  • The certificate's password is incorrect.

ArgumentException

The fileName parameter is null.

ASN.1 DER is the only certificate format supported by this class. Calling this constructor with the correct password decrypts the private key and saves it to a key container.

Security noteSecurity Note:

Never hard code a password within your source code. Hard-coded passwords can be retrieved from an assembly using the MSIL Disassembler (Ildasm.exe), a hex editor, or by simply opening the assembly in a text editor such as Notepad.exe.

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 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

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
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