X509Certificate.Import Method (String, SecureString, X509KeyStorageFlags)

Note: This method is new in the .NET Framework version 2.0.

Populates an X509Certificate object with information from a certificate file, a password, and a key storage flag.

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

public virtual void Import (
	string fileName,
	SecureString password,
	X509KeyStorageFlags keyStorageFlags
public void Import (
	String fileName, 
	SecureString password, 
	X509KeyStorageFlags keyStorageFlags
public function Import (
	fileName : String, 
	password : SecureString, 
	keyStorageFlags : X509KeyStorageFlags



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


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

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) l, a hex editor, or by simply opening the assembly in a text editor such as Notepad.exe.

  • 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 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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