VB 2010 WebBrowser Wait For Page To Load And Navigate New Page

i wan't to make program with 1 button and 1 webbrowser. When i click the button, the webbrowser navigate some page, and automaticly when the page load navigate new page and some code. i Try with some code, but the program crash.

Code:

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Private Sub WebBrowser1_DocumentCompleted(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
Select Case ???
      Case 1
  WebBrowser1.Navigate("page1")
  'Some Code
      Case 2
  WebBrowser1.Navigate("page2")
  'Another Code
      Case 3
  WebBrowser1.Navigate("page3")
  'Another Code
End Select
End Sub

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I don't know what need to write after "Select Case" Can you help me please?