Dim Filename As String = "Log.txt"
Dim DownUrl As String = Server.MapPath("../Logtext/") & Filename
Dim myStringWebResource As String = DownUrl
Dim myWebClient As New System.Net.WebClient
TextBox1.Text = "d:\" & Filename
myWebClient.DownloadFile(myStringWebResource, TextBox1.Text)
Label9.Text = "下载成功!"