VB.NET FTP File Download - asp.net

Question

I'm trying to set up my program to connect to my FTP and download files directly from my server. This what I have so far. I don't know what I'm doing wrong, or where I'm going wrong, because no matter how I code it either says "End Expected" or "Method can't handle etc due to signatures not being compatible"
I don't know what I'm doing wrong, any help would be greatly appreciated.
Private Sub Button16_Click(sender As Object, e As EventArgs) Handles Button16.Click
(ByVal downloadpath As String, ByVal ftpuri As String, ByVal ftpusername As String, ByVal ftppassword As String)
'Create a WebClient.
Dim request As New WebClient()
' Confirm the Network credentials based on the user name and password passed in.
request.Credentials = New Net.NetworkCredential("Username", "Password")
'Read the file data into a Byte array
Dim bytes() As Byte = request.DownloadData("ftp://ftp.yourwebsitename/file.extension")
Try
' Create a FileStream to read the file into
Dim DownloadStream As FileStream = IO.File.Create("C:\Local\Test.zip")
' Stream this data into the file
DownloadStream.Write(bytes, 0, bytes.Length)
' Close the FileStream
DownloadStream.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
MessageBox.Show("Process Complete")
End Sub

Answer 1

You probably pasted an existing method inside a Button.Click handler by mistake.
Rebuilding what was probably the original method is almost enough.
Note that this FTP procedure is a quite basic. You can rely on it only when downloading from a known remote resource. Also, as it it, it doesn't allow to show the download progress or even to cancel it.
Maybe take a look at the WebClient.DownloadDataAsync method, which allows to easily implement a progress bar and cancel the download procedure, when needed.
Also, if you're interested, in this SO question, you can find some notes and a sample Form, which can be included in a Project, to test some features of the FtpWebRequest.
Private Sub Button16_Click(sender As Object, e As EventArgs) Handles Button16.Click
Button16.Enabled = False
DownloadFile("C:\Local\Test.zip", "ftp://ftp.example.com/file.ext", "[username]", "[password]")
Button16.Enabled = True
End Sub
Private Sub DownloadFile(destinationPath As String, ftpResource As String, ftpUsername As String, ftpPassword As String)
Dim client As New WebClient()
client.Credentials = New NetworkCredential(ftpUsername, ftpPassword)
Try
Dim dataBytes() As Byte = client.DownloadData(ftpResource)
If dataBytes.Length > 0 Then
File.WriteAllBytes(destinationPath, dataBytes)
MessageBox.Show("Download Complete")
Else
MessageBox.Show("Download failed")
End If
Catch ex As WebException
MessageBox.Show(ex.Message)
Catch ex As IoException
MessageBox.Show(ex.Message)
End Try
End Sub

Answer 2

Here is a Console solution. Compile this into a exe file, and run it by double-clicking the executable or get a scheduler (i.e., Windos Task Scheduler) to open and run the file (it runs as soon as it opens).
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Linq
Imports System.Text
Imports System.Net
Imports System.IO
Namespace ConsoleApplication1
Class Program
Private Shared Sub Main(ParamArray ByVal args() As String)
If args.Any Then
' Do code that references args
Dim dt As DateTime = DateTime.Today.AddDays(-1)
Dim date As String = String.Format("{0:yyyyMMdd}", dt)
Dim p As Program = New Program
p.getFTPFile(("raw_CA_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_EM_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_GLB_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_US_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
Else
' Do code that depends on no input arguments.
Dim dt As DateTime = DateTime.Today.AddDays(-1)
Dim date As String = String.Format("{0:yyyyMMdd}", dt)
Dim p As Program = New Program
p.getFTPFile(("raw_CA_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_EM_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_GLB_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
p.getFTPFile(("raw_US_" _
+ (date + ".txt")))
' match a certain pattern in the name of the file
End If
End Sub
Private Sub getFTPFile(ByVal FTPFile As String)
FTPSettings.IP = "000.000.100.000"
FTPSettings.UserID = "your_id"
FTPSettings.Password = "your_password"
Dim reqFTP As FtpWebRequest = Nothing
Dim ftpStream As Stream = Nothing
Try
Dim outputStream As FileStream = New FileStream(("C:\Downloads\AFL_Files\" + FTPFile), FileMode.Create)
reqFTP = CType(FtpWebRequest.Create(("ftp://something#ftp.corp.com/your_path/" + FTPFile)),FtpWebRequest)
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile
reqFTP.UseBinary = true
reqFTP.Credentials = New NetworkCredential(FTPSettings.UserID, FTPSettings.Password)
Dim response As FtpWebResponse = CType(reqFTP.GetResponse,FtpWebResponse)
ftpStream = response.GetResponseStream
Dim cl As Long = response.ContentLength
Dim bufferSize As Integer = 2048
Dim readCount As Integer
Dim buffer() As Byte = New Byte((bufferSize) - 1) {}
readCount = ftpStream.Read(buffer, 0, bufferSize)
While (readCount > 0)
outputStream.Write(buffer, 0, readCount)
readCount = ftpStream.Read(buffer, 0, bufferSize)
End While
ftpStream.Close
outputStream.Close
response.Close
Catch ex As Exception
If (Not (ftpStream) Is Nothing) Then
ftpStream.Close
ftpStream.Dispose
End If
Throw New Exception(ex.Message.ToString)
End Try
End Sub
Public Class FTPSettings
Public Shared Property IP As String
Get
End Get
Set
End Set
End Property
Public Shared Property UserID As String
Get
End Get
Set
End Set
End Property
Public Shared Property Password As String
Get
End Get
Set
End Set
End Property
End Class
End Class
End Namespace