WebClient.DownloadString与2个URL一起使用

Question

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2
    Dim downloader As New WebClient
    downloader.Encoding = Encoding.UTF8
    Dim mystring As String = downloader.DownloadString("ONE LINK HERE" And "OTHER LINK HERE")    

    Dim myregex As String = "\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b:\d{2,5}"  
    Dim source As String = mystring  
    Dim findme As MatchCollection = Regex.Matches(source, myregex)  
    For Each mymatch As Match In findme  
        ListBox1.Items.Add(mymatch)  
    Next

在这里新建，抱歉格式化不好，我想做的就是同时从2个网址下载字符串而没有错误