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CryptoStream Constructor

Initializes a new instance of the CryptoStream class with a target data stream, the transformation to use, and the mode of the stream.

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

Public Sub New ( _
	stream As Stream, _
	transform As ICryptoTransform, _
	mode As CryptoStreamMode _
Dim stream As Stream 
Dim transform As ICryptoTransform 
Dim mode As CryptoStreamMode 

Dim instance As New CryptoStream(stream, _
	transform, mode)


Type: System.IO.Stream

The stream on which to perform the cryptographic transformation.

Type: System.Security.Cryptography.ICryptoTransform

The cryptographic transformation that is to be performed on the stream.

Type: System.Security.Cryptography.CryptoStreamMode

One of the CryptoStreamMode values.


stream is not readable.


stream is not writable.


stream is invalid.

Any object that derives from Stream can be passed into the stream parameter. Any object that implements ICryptoTransform (such as HashAlgorithm) can be passed into the transform parameter.

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0