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VB.NET Insert String

Use the Insert Function to add string data at an index to an existing String.
Insert. This Function places another String somewhere inside the first String. Using the Insert function on the String type, we create a longer String.Strings
Notes, strings. When we call Insert, a new string is created—the existing string is not modified. Insert() also is available on StringBuilder, which does modify an underlying buffer.StringBuilder
Insert example. We call Insert. We must assign a variable to the result of Insert to get the updated string. A new string is created upon the managed heap.

Argument 1: This is the index in the original string where we want to place the new substring. With 4, we place after the fourth char.

Argument 2: This is the new string we want to place inside of the original string. It will be found in the result.

VB.NET program that uses Insert function on String Module Module1 Sub Main() Dim value As String = "the cat" Console.WriteLine("INITIAL: {0}", value) ' Use Insert at an index. Dim result As String = value.Insert(4, "soft ") Console.WriteLine("INSERT: {0}", result) End Sub End Module Output INITIAL: the cat INSERT: the soft cat
Insert, IndexOf. We can use the IndexOf function with Insert. This demonstrates how we can search for the target index before passing that value to Insert.IndexOf

Insert: The first argument to Insert here is the index we received from IndexOf.

And: The index is the position of the start of the substring "cat" in the original string.

VB.NET program that uses Insert with IndexOf Module Module1 Sub Main() Dim value As String = "the soft cat" Console.WriteLine("INITIAL: {0}", value) ' Use Insert with IndexOf. Dim index As Integer = value.IndexOf("cat") Dim result As String = value.Insert(index, "orange ") Console.WriteLine("INSERT: {0}", result) End Sub End Module Output INITIAL: the soft cat INSERT: the soft orange cat
A summary. Strings are immutable. When we call Insert we must assign a variable reference to its result. Despite this possible complication, the Insert function is useful in many programs.
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