Private Sub DownloadData(ByVal URLString As String, ByVal LocalFile As String) 'LocalFile 是文件的一个完全路径 (包括*.exe)
Try
'HttpWebRequest 类对 WebRequest 中定义的属性和方法提供支持'，也对使用户能够直接与使用 HTTP 的服务器交互的附加属性和方法提供支持。
Dim httpReq As System.Net.HttpWebRequest
' HttpWebResponse 类用于生成发送 HTTP 请求和接收 HTTP 响'应的 HTTP 独立客户端应用程序。
Dim httpResp As System.Net.HttpWebResponse
Dim httpURL As New System.Uri(URLString)
httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)
httpReq.Method = "GET"
httpResp = CType(httpReq.GetResponse(), HttpWebResponse)
Dim reader As StreamReader = New StreamReader(httpResp.GetResponseStream) '如是中文，要设置编码格式为“GB2312”。
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是网页源代码
Dim Sw As StreamWriter = File.CreateText(LocalFile)
Sw.Write(respHTML)
Sw.Close()
httpResp.Close()
Catch e As Exception
Console.WriteLine("GetSource出现问题:{0},{1}", e.Message, URLString)
End Try
End Sub