String operation timing : String « Data Type « VB.Net Tutorial

1. VB.Net Tutorial
2. Data Type
3. String

Public Class Tester
    Public Shared Sub Main
        Dim content As String = ""
        Dim result As New System.Text.StringBuilder
        Dim counter As Integer
        Dim dateTime1 As Date
        Dim dateTime2 As Date
        Dim dateTime3 As Date
        Dim loopCount As Integer = 15000

        dateTime1 = Now

        For counter = 1 To loopCount
            content &= counter.ToString()
        Next counter
        dateTime2 = Now

        For counter = 1 To loopCount
            result.Append(counter.ToString())
        Next counter
        dateTime3 = Now

        content = String.Format( _
           "First loop took {0:G4} ms, the second took {1:G4} ms.", _
           dateTime2.Subtract(dateTime1).TotalMilliseconds, _
           dateTime3.Subtract(dateTime2).TotalMilliseconds)
        Console.WriteLine(content)
    End Sub
End Class

First loop took 1734 ms, the second took 0 ms.