Facebook is one of the top rated social media networking sites that impress everyone. More than 270 million users are using Facebook. 

Facebook connect -- this enables users to integrate Facebook platform to your website. This allow a user to connect with your site using the Facebook account and can share posts on your pages with friends on Facebook. The connection is established between Facebook and your website using a trusted authentication.

Before integrating Facebook on your website, you need to follow these steps:

Setting Up with Facebook

You’ll need to set up your application with Facebook. Set-up is free and happens pretty much instantaneously, because there’s no application approval process to go through.

1. Register your website with Facebook.

Log in to Facebook and visit the developer’s application at Facebook.com/developers. Here you can set up new applications and edit existing ones. You can also access SDK documentation and interact with the Facebook developer community.

In App Name: give the name of your site and continue. It will give you the Unique App ID/App Secret.

The URL of your website and the website URL you registered with Facebook should be same.

Note: If you want to access some additional information like Email ID etc, you have to use OAUTH (which is authorize the user and provide grant permissions to access).

2. Add Facebook DLL Refrences to your website/bin folder

- Facebook.dll  
- Facebook.web.dll

3. Web.config 

 Add the App ID/App Secret  value 

 <appSettings>
    <add key="redirect_uri" value="<your_redirect_uri>">
    <add key="AppKey" value="<your_App_ID>"/>
    <add key="AppSecret" value="<your_App_Secret>"/>
 </appSettings>

4. Add Facebook login button in your login.aspx page

<asp:Panel ID="pnlLogin" runat="server">
                    <a href="https://www.facebook.com/dialog/oauth?client_id=your_app_id&redirect_uri=your_redirect_uri">
                        <img src="../../images/f_login.png"  />
                    </a>
 </asp:Panel>
<a id="lbllogout" runat="server" onserverclick="lbllogout_Click" visible="false" > </a>

 For accessing some additional information like offline_access,email etc, you have to add scope feature in login like

<a href="https://www.facebook.com/dialog/oauth?client_id=your_app_id&redirect_uri=your_redirect_uri&scope=offline_access,user_status,publish_stream,email,manage_pages,user_groups">

It will ask you for allowing the permissions. Click Allow.

5. Now add code in login.aspx.cs to access Facebook user details in your page

using Facebook.Web;
using Facebook;

string getAccessToken = "";
WebClient client = new WebClient();

 protected void Page_Load(object sender, EventArgs e)
  {
           string fbCodeGiven = Request.QueryString["code"];
            if ((fbCodeGiven != null))
            {
                WebRequest AccessTokenWebRequest = WebRequest.Create("https://graph.facebook.com
                 /oauth/access_token?client_id=" + your_App_ID + "&redirect_uri=" +
                 your_redirect_uri  +  "&client_secret=" + your_App_Secret"] + "&code=" +
                 fbCodeGiven);

                StreamReader AccessTokenWebRequestStream = new
                StreamReader(AccessTokenWebRequest.GetResponse().GetResponseStream());
                string WebRequestResponse = AccessTokenWebRequestStream.ReadToEnd();
                getAccessToken = WebRequestResponse.Substring(13, WebRequestResponse.Length -
                                                13);

                Session["getAccessToken"] = getAccessToken;
                string url, userInformation, email = null, CorrectEmail = null, id = null,
                first_name = null, last_name = null;

                Regex getValues;
                Match infoMatch;
                string username = "me";
                url = "https://graph.facebook.com/" + username + "/" + "?access_token=" +
                          getAccessToken;

                userInformation = client.DownloadString(url);
                getValues = new Regex("(?<=\"email\":\")(.+?)(?=\")");
                infoMatch = getValues.Match(userInformation);
                email = infoMatch.Value;
                CorrectEmail = email.Replace("\\u0040", "@");

                getValues = new Regex("(?<=\"id\":\")(.+?)(?=\")");
                infoMatch = getValues.Match(userInformation);
                id = infoMatch.Value;
                Session["facebookuserID"] = id;

                getValues = new Regex("(?<=\"first_name\":\")(.+?)(?=\")");
                infoMatch = getValues.Match(userInformation);
                first_name = infoMatch.Value;

                getValues = new Regex("(?<=\"last_name\":\")(.+?)(?=\")");
                infoMatch = getValues.Match(userInformation);
                last_name = infoMatch.Value;
            }
}

protected void lbllogout_Click(object sender, EventArgs e)
{
            if (Convert.ToString(Session["facebookuserID"]) != "")
            {
                string getAccessToken = Convert.ToString(Session["getAccessToken"]);
                Session.Remove("facebookuserID");
                Response.Redirect("https://www.facebook.com/logout.php?next=" + your_redirect_uri
                                                 + "&access_token=" + getAccessToken);
                Session.Remove("getAccessToken");
            }
 }

The URL supplied in the next parameter must be a URL with the same base domain as your application as defined in your app's settings.

IMPORTANT NOTE -- You must replace "your_App_ID", "your_App_Secret" with the APP ID, APP Secret you find in your application details in the Developer application on Facebook!

Then, run your application/site. Hope this tutorial help.

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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