IsMemberOf Method (GroupPrincipal)
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Principal.IsMemberOf Method (GroupPrincipal)

Returns a Boolean value that specifies whether the principal is a member of the specified group.

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

public bool IsMemberOf(
	GroupPrincipal group


Type: System.DirectoryServices.AccountManagement.GroupPrincipal

The GroupPrincipal object for which principal membership is determined.

Return Value

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


The GroupPrincipal specified in the group parameter could not be found.


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.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

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