OK, I will talk again about FileUpload Control. Last week I have discussed about how to fix FileUpload Control that not work in Update Panel. FileUpload Control really help us to accepting file uploads from users. It is very easy now. Please see the example below. However, please notice that there are security concerns to to consider when accepting files from users! Here is the markup required:

<form id="form1" runat="server">
    <asp:FileUpload id="FileUploadControl" runat="server" />
    <asp:Button runat="server" id="UploadButton" text="Upload" onclick="UploadButton_Click" />
    <br /><br />
    <asp:Label runat="server" id="StatusLabel" text="Upload status: " />
</form>

And here is the CodeBehind code required to handle the upload:

protected void UploadButton_Click(object sender, EventArgs e)
{
    if(FileUploadControl.HasFile)
    {
        try
        {
            string filename = Path.GetFileName(FileUploadControl.FileName);
            FileUploadControl.SaveAs(Server.MapPath("~/") + filename);
            StatusLabel.Text = "Upload status: File uploaded!";
        }
        catch(Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

As you can see, it's all relatively simple. Once the UploadButton is clicked, we check to see if a file has been specified in the upload control. If it has, we use the FileUpload controls SaveAs method to save the file. We use the root of our project (we use the MapPath method to get this) as well as the name part of the path which the user specified. If everything goes okay, we notify the user by setting the Text property of the StatusLabel - if not, an exception will be thrown, and we notify the user as well.

This example will get the job done, but as you can see, nothing is checked. The user can upload any kind of file, and the size of the file is only limited by the server configuration. A more robust example could look like this:

protected void UploadButton_Click(object sender, EventArgs e)
{
    if(FileUploadControl.HasFile)
    {
        try
        {
            if(FileUploadControl.PostedFile.ContentType == "image/jpeg")
            {
                if(FileUploadControl.PostedFile.ContentLength < 102400)
                {
                    string filename = Path.GetFileName(FileUploadControl.FileName);
                    FileUploadControl.SaveAs(Server.MapPath("~/") +
filename);
                    StatusLabel.Text = "Upload status: File uploaded!";
                }
                else
                    StatusLabel.Text = "Upload status: The file has to be less than 100 kb!";
            }
            else
                StatusLabel.Text = "Upload status: Only JPEG files are accepted!";
        }
        catch(Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

Here we use the two properties, ContentLength and ContentType, to do some basic checking of the file which the user is trying to upload. The status messages should clearly indicate what they are all about, and you can change them to fit your needs.

This is brief tutorial how to download file from FTP using C#/VB.NET. Let’s start it:

C#

using System.Net;
using System.IO;

VB.NET

Imports System.Net
Imports System.IO

Following is the code of download file from the FTP Server.

C#

private void Download(string filePath, string fileName)
   {
       FTPSettings.IP = "DOMAIN NAME";
       FTPSettings.UserID = "USER ID";
       FTPSettings.Password = "PASSWORD";
       FtpWebRequest reqFTP = null;
       Stream ftpStream = null;
       try
       {
           FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);
           reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + FTPSettings.IP + "/" + fileName));
           reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
           reqFTP.UseBinary = true;
           reqFTP.Credentials = new NetworkCredential(FTPSettings.UserID, FTPSettings.Password);
           FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
           ftpStream = response.GetResponseStream();
           long cl = response.ContentLength;
           int bufferSize = 2048;
           int readCount;
           byte[] buffer = new byte[bufferSize];

           readCount = ftpStream.Read(buffer, 0, bufferSize);
           while (readCount > 0)
           {
               outputStream.Write(buffer, 0, readCount);
               readCount = ftpStream.Read(buffer, 0, bufferSize);
           }

           ftpStream.Close();
           outputStream.Close();
           response.Close();
       }
       catch (Exception ex)
       {
           if (ftpStream != null)
           {
               ftpStream.Close();
               ftpStream.Dispose();
           }
           throw new Exception(ex.Message.ToString());
       }
   }
   public static class FTPSettings
   {
       public static string IP { get; set; }
       public static string UserID { get; set; }
       public static string Password { get; set; }
   }

VB.NET

   Private Sub Download(ByVal filePath As String, ByVal fileName As String)
       FTPSettings.IP = "DOMAIN NAME"
       FTPSettings.UserID = "USER ID"
       FTPSettings.Password = "PASSWORD"
       Dim reqFTP As FtpWebRequest = Nothing
       Dim ftpStream As Stream = Nothing
       Try
           Dim outputStream As New FileStream(filePath + "\" + fileName, FileMode.Create)
           reqFTP = DirectCast(FtpWebRequest.Create(New Uri("ftp://" + FTPSettings.IP + "/" + fileName)), FtpWebRequest)
           reqFTP.Method = WebRequestMethods.Ftp.DownloadFile
           reqFTP.UseBinary = True
           reqFTP.Credentials = New NetworkCredential(FTPSettings.UserID, FTPSettings.Password)
           Dim response As FtpWebResponse = DirectCast(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 ftpStream IsNot Nothing Then
               ftpStream.Close()
               ftpStream.Dispose()
           End If
           Throw New Exception(ex.Message.ToString())
       End Try
   End Sub
   Public NotInheritable Class FTPSettings
       Private Sub New()
       End Sub
       Public Shared Property IP() As String
           Get
               Return m_IP
           End Get
           Set(ByVal value As String)
               m_IP = Value
           End Set
       End Property
       Private Shared m_IP As String
       Public Shared Property UserID() As String
           Get
               Return m_UserID
           End Get
           Set(ByVal value As String)
               m_UserID = Value
           End Set
       End Property
       Private Shared m_UserID As String
       Public Shared Property Password() As String
           Get
               Return m_Password
           End Get
           Set(ByVal value As String)
               m_Password = Value
           End Set
       End Property
       Private Shared m_Password As String
   End Class

Hope you enjoy this simple tutorial. :)

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