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ActiveDirectorySiteCollection.IndexOf Method

Returns the zero-based index of the first occurrence of the specified ActiveDirectorySite object in this collection.

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

public int IndexOf(
	ActiveDirectorySite site


Type: System.DirectoryServices.ActiveDirectory.ActiveDirectorySite

The ActiveDirectorySite object to search for in this collection.

Return Value

Type: System.Int32
The zero-based index of the first matching object. Returns -1 if no member of this collection is identical to the ActiveDirectorySite object.


A call to the underlying directory service resulted in an error.


site is null.


The ActiveDirectorySite object has not yet been saved in the Active Directory Domain Services store.

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

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