[02/03] check web url

[csKanna]

Hi,

How to check whether a web url or image exists? (when we access it returns 404 not found error) ..

thanks in advance

[jeremyslaton]

This is an example of what I use in VB2008

It checks the url in my.settings.enteredURL
If it is a bad URL then it navigates the web browser on my form to http:\\www.google.com otherwise it navigates to the URL that it checked.

    Sub updateURL()

        Dim URL As String
        Dim httpCheck As String = UCase(My.Settings.enteredURL)

        'Make sure URL starts with http
        If httpCheck.StartsWith("HTTP:\\") Or httpCheck.StartsWith("HTTP://") Then
            URL = My.Settings.enteredURL
        Else
            URL = ("http://" & My.Settings.enteredURL)
        End If

        Try
            Dim myWebClient As System.Net.WebClient = New System.Net.WebClient()

            Dim myStream As System.IO.Stream = myWebClient.OpenRead(URL)

            Dim myStreamReader As System.IO.StreamReader = New System.IO.StreamReader(myStream)

            Dim s As String = myStreamReader.ReadToEnd

            myStreamReader = Nothing

            myStream = Nothing

            myWebClient = Nothing

        Catch

            URL = "http:\\www.google.com"

        End Try

        webbrower1.Navigate(New Uri(URL))

    End Sub

Hope This Helps!