' Navigates to the URL in the address box when 
' the ENTER key is pressed while the ToolStripTextBox has focus.
Private Sub toolStripTextBox1_KeyDown( _
    ByVal sender As Object, ByVal e As KeyEventArgs) _
    Handles toolStripTextBox1.KeyDown

    If (e.KeyCode = Keys.Enter) Then
        Navigate(toolStripTextBox1.Text)
    End If

End Sub

' Navigates to the URL in the address box when 
' the Go button is clicked.
Private Sub goButton_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles goButton.Click

    Navigate(toolStripTextBox1.Text)

End Sub

' Navigates to the given URL if it is valid.
Private Sub Navigate(ByVal address As String)

    If String.IsNullOrEmpty(address) Then Return
    If address.Equals("about:blank") Then Return
    If Not address.StartsWith("http://") And _
        Not address.StartsWith("https://") Then
        address = "http://" & address
    End If

    Try
        webBrowser1.Navigate(New Uri(address))
    Catch ex As System.UriFormatException
        Return
    End Try

End Sub

' Updates the URL in TextBoxAddress upon navigation.
Private Sub webBrowser1_Navigated(ByVal sender As Object, _
    ByVal e As WebBrowserNavigatedEventArgs) _
    Handles webBrowser1.Navigated

    toolStripTextBox1.Text = webBrowser1.Url.ToString()

End Sub

' 导入命名空间
Imports System.Windows.Forms

public class WebBrowserDemo
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1

    Private Sub txtURL_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txtURL.KeyDown
        If (e.KeyCode = Keys.Enter) Then
            WebBrowser1.Navigate(txtURL.Text)
        End If
    End Sub

    Private Sub btnBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBack.Click
        WebBrowser1.GoBack()
    End Sub

    Private Sub btnForward_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForward.Click
        WebBrowser1.GoForward()
    End Sub

    Private Sub btnHome_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnHome.Click
        WebBrowser1.GoHome()
    End Sub
End Class
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.ToolStrip1 = New System.Windows.Forms.ToolStrip
        Me.ToolStripLabel1 = New System.Windows.Forms.ToolStripLabel
        Me.txtURL = New System.Windows.Forms.ToolStripTextBox
        Me.btnBack = New System.Windows.Forms.ToolStripButton
        Me.btnForward = New System.Windows.Forms.ToolStripButton
        Me.btnHome = New System.Windows.Forms.ToolStripButton
        Me.WebBrowser1 = New System.Windows.Forms.WebBrowser
        Me.ToolStrip1.SuspendLayout()
        Me.SuspendLayout()

        Me.ToolStrip1.Items.AddRange(New System.Windows.Forms.ToolStripItem() {Me.ToolStripLabel1, Me.txtURL, Me.btnBack, Me.btnForward, Me.btnHome})
        Me.ToolStrip1.Location = New System.Drawing.Point(0, 0)
        Me.ToolStrip1.Size = New System.Drawing.Size(703, 25)

        Me.ToolStripLabel1.Size = New System.Drawing.Size(50, 22)
        Me.ToolStripLabel1.Text = "Address:"

        Me.txtURL.Size = New System.Drawing.Size(200, 25)

        Me.btnBack.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text
        Me.btnBack.ImageTransparentColor = System.Drawing.Color.Magenta
        Me.btnBack.Name = "btnBack"
        Me.btnBack.Size = New System.Drawing.Size(33, 22)
        Me.btnBack.Text = "Back"
        '
        'btnForward
        '
        Me.btnForward.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text
        Me.btnForward.ImageTransparentColor = System.Drawing.Color.Magenta
        Me.btnForward.Name = "btnForward"
        Me.btnForward.Size = New System.Drawing.Size(51, 22)
        Me.btnForward.Text = "Forward"
        '
        'btnHome
        '
        Me.btnHome.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text
        Me.btnHome.ImageTransparentColor = System.Drawing.Color.Magenta
        Me.btnHome.Name = "btnHome"
        Me.btnHome.Size = New System.Drawing.Size(38, 22)
        Me.btnHome.Text = "Home"
        '
        'WebBrowser1
        '
        Me.WebBrowser1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.WebBrowser1.Location = New System.Drawing.Point(0, 25)
        Me.WebBrowser1.MinimumSize = New System.Drawing.Size(20, 20)
        Me.WebBrowser1.Name = "WebBrowser1"
        Me.WebBrowser1.Size = New System.Drawing.Size(703, 429)
        Me.WebBrowser1.TabIndex = 1
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(703, 454)
        Me.Controls.Add(Me.WebBrowser1)
        Me.Controls.Add(Me.ToolStrip1)
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "MyBrowser"
        Me.ToolStrip1.ResumeLayout(False)
        Me.ToolStrip1.PerformLayout()
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents ToolStrip1 As System.Windows.Forms.ToolStrip
    Friend WithEvents WebBrowser1 As System.Windows.Forms.WebBrowser
    Friend WithEvents ToolStripLabel1 As System.Windows.Forms.ToolStripLabel
    Friend WithEvents txtURL As System.Windows.Forms.ToolStripTextBox
    Friend WithEvents btnBack As System.Windows.Forms.ToolStripButton
    Friend WithEvents btnForward As System.Windows.Forms.ToolStripButton
    Friend WithEvents btnHome As System.Windows.Forms.ToolStripButton

End Class