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List.System.Collections.IList.Item Property

Gets or sets the element at the specified index.

Namespace: System.Collections.Generic
Assembly: mscorlib (in mscorlib.dll)

Object IList.this [
	int index
] { get; set; }
Not applicable.



The zero-based index of the element to get or set.

Property Value

The element at the specified index.

Exception typeCondition


index is not a valid index in the IList.


The property is set and value is of a type that is not assignable to the IList.

The C# language uses the this keyword to define the indexers instead of implementing the System.Collections.IList.Item property. Visual Basic implements System.Collections.IList.Item as a default property, which provides the same indexing functionality.

Retrieving the value of this property is an O(1) operation; setting the property is also an O(1) operation.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

.NET Compact Framework

Supported in: 2.0