Socket for website

[Take0n]

Hello

I am making a program that downloads videos from youtube but the problem I have is a problem I had before and will sure have in the future!

Well when connecting to a website (in this case youtube: http://www.youtube.com/watch?v=mHwV2JuwZls), I read the data and display it in a textbox BUT if the link doesn't exists I don't get any errors or something! If I i.e. use a link that doesn't exist in youtube: http://www.youtube.com/watch?v=mHwV2JuwZlx then I don't get any errors or data and that is because youtube redirects the error page to another link in this case http://www.youtube.com/browse?&sess...ELq0NGfPsfW6qmGT7SUissDt_xWE-8gTZtxjN2SMw9GvK

The code I use is:

Private Function GetLink(ByVal URL As String) As String
        On Error GoTo Err
        Dim WReq As System.Net.WebRequest = System.Net.WebRequest.Create(URL)
        Dim WRes As System.Net.WebResponse = WReq.GetResponse()
        Dim strRes As String
        Dim Enc As System.Text.Encoding
        Dim SR As System.IO.StreamReader = New System.IO.StreamReader(WRes.GetResponseStream(), Enc.Default)
        strRes = SR.ReadToEnd
        WRes.Close()
        If (strRes <> "") Then
            TextBox1.Text = strRes
        Else
            MsgBox("The given link is not working" & vbCrLf & "Wrong link?", MsgBoxStyle.Critical, "Error")
        End If
Err:
        Return ""
        MsgBox("There was an error connecting to the website", MsgBoxStyle.Critical, "Error")
        Exit Function
    End Function

I want to know if its possible to get the redirected link or what to do to know if the video link exists or not! The "else" doesn't even occur and I can't understand why I end up with a blank textbox and no msgbox!

Sorry for my bad English but I hope you can understand what I want to do and what my problem is!