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IndexOutOfRangeException Class

The exception that is thrown when an attempt is made to access an element of an array with an index that is outside the bounds of the array. This class cannot be inherited.

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

public sealed class IndexOutOfRangeException : SystemException

The following Microsoft intermediate language (MSIL) instructions throw IndexOutOfRangeException :

  • ldelem.<type>

  • ldelema

  • stelem.<type>

IndexOutOfRangeException uses the HRESULT COR_E_INDEXOUTOFRANGE, which has the value 0x80131508.

The most common causes of this exception are miscalculating a lookup index, or using the wrong start or end point when iterating. For other causes, see Troubleshooting Exceptions: System.IndexOutOfRangeException.

For a list of initial property values for an instance of IndexOutOfRangeException, see the IndexOutOfRangeException constructors.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0