ASP.NET文件下载

        Response.ContentType = "text/plain"

        Dim file As New IO.FileInfo(System.Web.HttpContext.Current.Server.MapPath("路径")))

        If file.Exists Then
        　　Response.AddHeader("content-disposition", String.Format("attachment;filename={0}", file.Name))
        　　Response.WriteFile(file.FullName)
        　　Response.End()
        End If