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CngKey.Exists Method (String, CngProvider, CngKeyOpenOptions)

Checks to see whether a named key exists in the specified key storage provider (KSP), according to the specified options.

Namespace:  System.Security.Cryptography
Assembly:  System.Core (in System.Core.dll)
public static bool Exists(
	string keyName,
	CngProvider provider,
	CngKeyOpenOptions options


Type: System.String

The key name.

Type: System.Security.Cryptography.CngProvider

The KSP to search for the key.

Type: System.Security.Cryptography.CngKeyOpenOptions

A bitwise combination of the enumeration values that specify options for opening a key.

Return Value

Type: System.Boolean
true if the named key exists in the specified provider; otherwise, false.

keyName or provider is null.


Cryptography Next Generation (CNG) is not supported on this system.


All other errors.

Use this overload to check for the existence of a key in a KSP other than the default MicrosoftSoftwareKeyStorageProvider, and to specify key open options.

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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