Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'TextBox1
        '
        Me.TextBox1.Anchor = (((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.TextBox1.Font = New System.Drawing.Font("Comic Sans MS", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(8, 8)
        Me.TextBox1.MaxLength = 0
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.TextBox1.Size = New System.Drawing.Size(432, 288)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.Anchor = (System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right)
        Me.Button1.Font = New System.Drawing.Font("Comic Sans MS", 12!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(272, 304)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(168, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Count Words"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(448, 341)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox1, Me.Button1})
        Me.Name = "Form1"
        Me.Text = "Count Words"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim SB As New System.[Text].StringBuilder()
        Dim searchWord As String

        searchWord = InputBox("Please enter the word " & _
                         "to search for", _
                         "StringBuilder Search Example", "BASIC")
        Dim startIndex As Integer
        SB.Append(Textbox1.Text)
        startIndex = SB.ToString.ToUpper.IndexOf(searchWord.ToUpper)

        Dim T1, T2 As Date
        Dim SP As New TimeSpan()
        T1 = Now()

        Dim count As Integer
        If startIndex = 0 Then
            MsgBox("The string you’re searching for wasn’t found", MsgBoxStyle.OKOnly, searchWord)
        End If
        ' We have found one instance of the word
        ' set up a loop to go through all the remaining instances
        ' of the same word.

        While startIndex > 0 And _
                       startIndex + searchWord.Length < SB.Length
            count = count + 1
            startIndex = SB.ToString.ToUpper.IndexOf(searchWord.ToUpper, startIndex + searchWord.Length + 1)
        End While
        T2 = Now
        SP = T2.Subtract(T1)
        Dim msg As String
        msg = "Located " & count.ToString & _
              " instances of the word in " & SP.Milliseconds.ToString & " milliseconds"
        MsgBox(msg, MsgBoxStyle.OKOnly, searchWord)
    End Sub
End Class