How to Zoom In and Out in WebBrowser using VB.Net

This Tutorial is all about How to Zoom In and Out in WebBrowser using VB.Net. In this tutorial you will be able to Zoom In and Out in WebBrowser using VB.Net. So lets get Started:

• First is open the Visual Basic, Select File on the menu, then click New and create a new project.

• Then a New Project Dialog will appear. You can rename your project, depending on what you like to name it. After that click OK

• After that, design your form like this just like what I’ve shown you below.
  
  Add a Webbrowser and Button to the form.
  
  

  

• Then add this following declarations.
  

[vbnet]
Dim InitialZoom As Integer = 100
Public Enum Exec
OLECMDID_OPTICAL_ZOOM = 63
End Enum
Private Enum execOpt
OLECMDEXECOPT_DODEFAULT = 0
OLECMDEXECOPT_PROMPTUSER = 1
OLECMDEXECOPT_DONTPROMPTUSER = 2
OLECMDEXECOPT_SHOWHELP = 3
End Enum
[/vbnet]

<li>Then add this code to the Form Load Event.<br></li>

[vbnet]
WebBrowser1.Navigate("http://www.google.com")
[/vbnet]

<li>Add this code to the after that, This will handle the zooming.<br></li>

[vbnet]
Public Sub PerformZoom(ByVal Value As Integer)
Try
Dim Res As Object = Nothing
Dim MyWeb As Object
MyWeb = Me.WebBrowser1.ActiveXInstance
MyWeb.ExecWB(Exec.OLECMDID_OPTICAL_ZOOM, execOpt.OLECMDEXECOPT_PROMPTUSER, CObj(Value), CObj(IntPtr.Zero))
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
[/vbnet]

<li>Add this code to the Zoom in Button.<br></li>

[vbnet]
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
InitialZoom += 10
PerformZoom(InitialZoom)
End Sub
[/vbnet]

<li>Add this code to the Zoom out Button.<br></li>

[vbnet]
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
InitialZoom -= 10
PerformZoom(InitialZoom)
End Sub
[/vbnet]

<li>Finally, Click F5 to run Program</li>

OUTPUT:

ZOOM INZOOM OUT

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