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List<T>.IList.Insert Method (Int32, Object)


Inserts an item to the IList at the specified index.

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

void IList.Insert(
	int index,
	object item


Type: System.Int32

The zero-based index at which item should be inserted.

Type: System.Object

The object to insert into the IList.

Exception Condition

index is not a valid index in the IList.


item is of a type that is not assignable to the IList.

If index equals the number of items in the IList, then item is appended to the end.

This method is an O(n) operation, where n is Count.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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