IsMemberOf Method (PrincipalContext, IdentityType, String)
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Principal.IsMemberOf Method (PrincipalContext, IdentityType, String)

Returns a Boolean value that specifies whether the principal is a member of the group specified by identity type and value.

Namespace:  System.DirectoryServices.AccountManagement
Assembly:  System.DirectoryServices.AccountManagement (in System.DirectoryServices.AccountManagement.dll)

public bool IsMemberOf(
	PrincipalContext context,
	IdentityType identityType,
	string identityValue


Type: System.DirectoryServices.AccountManagement.PrincipalContext
The PrincipalContext that specifies the server or domain against which operations are performed.
Type: System.DirectoryServices.AccountManagement.IdentityType
A IdentityType enumeration value that specifies the type of the identity value.
Type: System.String
The identity of the group.

Return Value

Type: System.Boolean
true if the principal is a member of the specified group; otherwise false.


The identity type or value does not correspond to a GroupPrincipal.


More than one matching GroupPrincipal was found.

If the current principal is an AD DS principal, the returned groups include the principal's primary group, as indicated by the primary group ID attribute on the AD DS object.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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