I want to convert *.aspx (HTML) page's (User Interface) to Image such as JPEG. I am using below code for that

Protected Sub btnGet_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnGet.Click saveURLToImage("http://google.co.in") End Sub

Private Sub saveURLToImage(ByVal url As String) If Not String.IsNullOrEmpty(url) Then Dim content As String = ""

        Dim webRequest__1 As System.Net.WebRequest = WebRequest.Create(url)
        Dim webResponse As System.Net.WebResponse = webRequest__1.GetResponse()
        Dim sr As System.IO.StreamReader = New StreamReader(webResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("UTF-8"))
        content = sr.ReadToEnd()
        'save to file
        Dim b As Byte() = Convert.FromBase64String(content)
        Dim ms As New System.IO.MemoryStream(b, 0, b.Length)
        Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)
        img.Save("c:\pic.jpg", System.Drawing.Imaging.ImageFormat.Jpeg)

        img.Dispose()
        ms.Close()
    End If
End Sub

But I am getting Error as "Invalid character in a Base-64 string" at line Dim b As Byte() = Convert.FromBase64String(content)