form1.vb

Mastering VBNet Include Source Code

Option Strict On
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 ListBox1 As System.Windows.Forms.ListBox
    Friend WithEvents bttnFind As System.Windows.Forms.Button
    Friend WithEvents bttnPopulate As System.Windows.Forms.Button

    '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.ListBox1 = New System.Windows.Forms.ListBox()
        Me.bttnFind = New System.Windows.Forms.Button()
        Me.bttnPopulate = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'ListBox1
        '
        Me.ListBox1.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.ListBox1.ItemHeight = 14
        Me.ListBox1.Location = New System.Drawing.Point(8, 8)
        Me.ListBox1.Name = "ListBox1"
        Me.ListBox1.Size = New System.Drawing.Size(200, 256)
        Me.ListBox1.TabIndex = 0
        '
        'bttnFind
        '
        Me.bttnFind.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.bttnFind.Location = New System.Drawing.Point(216, 48)
        Me.bttnFind.Name = "bttnFind"
        Me.bttnFind.Size = New System.Drawing.Size(152, 32)
        Me.bttnFind.TabIndex = 1
        Me.bttnFind.Text = "Find Item"
        '
        'bttnPopulate
        '
        Me.bttnPopulate.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.bttnPopulate.Location = New System.Drawing.Point(216, 8)
        Me.bttnPopulate.Name = "bttnPopulate"
        Me.bttnPopulate.Size = New System.Drawing.Size(152, 32)
        Me.bttnPopulate.TabIndex = 2
        Me.bttnPopulate.Text = "Populate List"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(392, 277)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.bttnPopulate, Me.bttnFind, Me.ListBox1})
        Me.Name = "Form1"
        Me.Text = "ListBoxFind Demo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub bttnPopulate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnPopulate.Click
        Dim wordLen As Integer
        Dim Nwords As Integer = 9999

        Dim rnd As System.Random
        rnd = New System.Random()
        Dim rndChar As Char

        Dim thisWord As String
        Dim i, j As Integer

        For i = 0 To Nwords
            wordLen = CInt(rnd.NextDouble * 20 + 1)
            thisWord = ""
            For j = 0 To wordLen
                rndChar = Chr(65 + CInt(rnd.Next(0, 25)))
                thisWord = thisWord & rndChar
            Next
            ListBox1.Items.Add(thisWord)
        Next
    End Sub

    Private Sub bttnFind_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnFind.Click
        Dim srchWord As String
        Dim wordIndex As Integer
        srchWord = InputBox("Enter word to search for")
        wordIndex = ListBox1.FindStringExact(srchWord)
        If wordIndex >= 0 Then
            MsgBox("Index = " & wordIndex.ToString & "   =" & _
             (ListBox1.Items(wordIndex)).ToString, , "EXACT MATCH")
            ListBox1.TopIndex = wordIndex
            ListBox1.SelectedIndex = wordIndex
        Else
            wordIndex = ListBox1.FindString(srchWord)
            If wordIndex >= 0 Then
                MsgBox("Index = " & wordIndex.ToString & "   =" & _
                 (ListBox1.Items(wordIndex)).ToString, , "NEAR MATCH")
                ListBox1.TopIndex = wordIndex
                ListBox1.SelectedIndex = wordIndex
            Else
                MsgBox("Item " & srchWord & " is not in the list")
            End If
        End If
    End Sub
End Class