VB.NET can't download 10MB file and higher from FTP Server.

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Hi everyone,
I have a program that downloads file from FTP Server.
This is my code for downloading files

VB

Dim request As FtpWebRequest = Nothing
    Dim response As FtpWebResponse = Nothing
    request = DirectCast(FtpWebRequest.Create(New Uri(clsDownload(index).FTPURL)), FtpWebRequest)
    request.ServicePoint.ConnectionLimit = maxDownload
    request.Method = WebRequestMethods.Ftp.DownloadFile
    request.UseBinary = True
    request.UsePassive = True
    request.KeepAlive = False
    request.Credentials = New NetworkCredential(username, password)
    response = DirectCast(request.GetResponse(), FtpWebResponse)
    Dim ftpStream As Stream = response.GetResponseStream()

    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
    outputStream.Close()

The above code runs fine when the filesize is less than 10MB.
When file is greater than 10MB the program can't download the file.
Well at first the file is downloaded, let say the file is 11000KB the program will download the file to 10999 the last 1KB causes error... don't know whats wrong with my code.

This is the error
The underlying connection was closed: An unexpected error occurred on a receive.

I just try using different bufferSize(1000, 32 * 1024) but same error occured...

Posted 26-Jun-12 23:33pm

hansoctantan

Updated 27-Jun-12 3:07am

v3

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Comments

Bernhard Hiller 27-Jun-12 6:40am

Did you check that the file on the server is OK (e.g. by downloading with Internet Explorer)?
How do you know that the downloaded file is not OK? Do you get any error messages?
Does that behavior also happen with a larger bufferSize (e.g. 1048576)?

hansoctantan 27-Jun-12 8:05am

I will try it...

hansoctantan 27-Jun-12 8:09am

and yes I get a runtime error

hansoctantan 27-Jun-12 8:14am

Yes it successfully downloaded the file in mozilla browser manually...

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Jαved · Answer 1 · 2012-06-27T02:05:00

Solution 1

Check this question might help you-
Download large file from FTP C#[^]

Posted 27-Jun-12 2:05am

Jαved

Ayush Swiss · Answer 2 · 2012-06-27T02:08:00

C#

string[] files ={ "UserList.csv", "Catalog.csv", "DeleteUser.csv" };

                Sftp sftp = new Sftp(ftpServerIPAndPort, ftpUserName, decryptor(ftpPassword));

                sftp.Connect(22);
                foreach (string filename in files)
                {
                   sftp.Get(ftpRootFolder + filename, Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles) + @"\Ayush\CSVFilesBackup/" + filename);
                  
                }

                       
This Example Fetch these three files from SFTP of any size........... Try This