Use StringBuilder Indexer : StringBuilder « Data Type « VB.Net Tutorial

Imports System.Text

Module Tester

   Sub Main()
      Dim i As Integer
      Dim buffer As StringBuilder = New StringBuilder("Hello, how are you?")

      ' use StringBuilder Indexer
      For i = 0 To buffer.Length - 1
         Console.WriteLine(buffer(i))
      Next

   End Sub 

End Module

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2.40.StringBuilder
	2.40.1.	Demonstrating StringBuilder class constructors
	2.40.2.	StringBuilder: Insert string, Append and Replace
	2.40.3.	Append Char to StringBuilder
	2.40.4.	Demonstrating StringBuilder Append methods
	2.40.5.	StringBuilder AppendFormat
	2.40.6.	StringBuilder.AppendFormat: {0:D} is ${1: #,###.00}
	2.40.7.	Replace method.
	2.40.8.	Insert method of StringBuilder
	2.40.9.	StringBuilder: Length, Capacity, EnsureCapacity
	2.40.10.	Use StringBuilder Indexer
	2.40.11.	Demonstrating methods Insert and Remove of the StringBuilder class
	2.40.12.	Demonstrating method Replace
	2.40.13.	Use StringBuilder to reverse a string
	2.40.14.	StringBuilder.ToStrings
	2.40.15.	Performance difference between String and StringBuilder