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 bttnFileOpen As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog

    '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.bttnFileOpen = New System.Windows.Forms.Button()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        Me.SuspendLayout()
        '
        'bttnFileOpen
        '
        Me.bttnFileOpen.Font = New System.Drawing.Font("Verdana", 12!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.bttnFileOpen.Location = New System.Drawing.Point(128, 8)
        Me.bttnFileOpen.Name = "bttnFileOpen"
        Me.bttnFileOpen.Size = New System.Drawing.Size(304, 32)
        Me.bttnFileOpen.TabIndex = 0
        Me.bttnFileOpen.Text = "Open and Read Text File"
        '
        'TextBox1
        '
        Me.TextBox1.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(8, 48)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.TextBox1.Size = New System.Drawing.Size(528, 304)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(544, 357)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox1, Me.bttnFileOpen})
        Me.Name = "Form1"
        Me.Text = "OpenFile Method Demo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnFileOpen.Click
        If OpenFileDialog1.ShowDialog() = DialogResult.Cancel Then Exit Sub
        Dim str As System.IO.Stream = OpenFileDialog1.OpenFile

        Dim txt As New System.Text.StringBuilder()
        Dim L As Integer = str.Length
        Dim buffer(L) As Byte
        If str.Read(buffer, 0, L) = 0 Then Exit Sub

        Dim i As Integer
        For i = 0 To L
            txt.Append(Chr(buffer(i)))
        Next

        str.Close()
        TextBox1.Text = txt.ToString
    End Sub
End Class