Performance difference between String and StringBuilder : StringBuilder « Data Type « VB.Net Tutorial

Imports System.Text
 
public class Test

   public Shared Sub Main
        Const ADD_STRING As String = "1234567890"
        Dim num_trials As Long = 1000
        Dim start_time As DateTime
        Dim stop_time As DateTime
        Dim elapsed_time As TimeSpan
        Dim txt As String
        Dim string_builder As New StringBuilder

        txt = ""
        start_time = Now
        For i As Long = 1 To num_trials
            txt = txt & ADD_STRING
        Next i
        stop_time = Now
        elapsed_time = stop_time.Subtract(start_time)
        Console.WriteLine(elapsed_time.TotalSeconds.ToString("0.000000"))

        txt = ""
        start_time = Now
        For i As Long = 1 To num_trials
            string_builder.Append(ADD_STRING)
        Next i
        txt = string_builder.ToString()
        stop_time = Now
        elapsed_time = stop_time.Subtract(start_time)
        Console.WriteLine(elapsed_time.TotalSeconds.ToString("0.000000"))

   End Sub

End class

0.015625
0.000000

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