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


Inserts an item to the IList<T> at the specified index.

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

void Insert(
	int index,
	T item


Type: System.Int32

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

Type: T

The object to insert into the IList<T>.

Exception Condition

index is not a valid index in the IList<T>.


The IList<T> is read-only.

If index equals the number of items in the IList<T>, then item is appended to the list.

In collections of contiguous elements, such as lists, the elements that follow the insertion point move down to accommodate the new element. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.

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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