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String.Insert Method

Returns a new string in which a specified string is inserted at a specified index position in this instance.

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

member Insert : 
        startIndex:int * 
        value:string -> string

Parameters

startIndex
Type: System.Int32

The zero-based index position of the insertion.

value
Type: System.String

The string to insert.

Return Value

Type: System.String
A new string that is equivalent to this instance, but with value inserted at position startIndex.

ExceptionCondition
ArgumentNullException

value is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

startIndex is negative or greater than the length of this instance.

If startIndex is equal to the length of this instance, value is appended to the end of this instance.

NoteNote

This method does not modify the value of the current instance. Instead, it returns a new string in which value is inserted into the current instance.

For example, the return value of "abc".Insert(2, "XYZ") is "abXYZc".

The following console application provides a simple demonstration of the Insert method.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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