Embed a Document in a post in SharePoint Server 2013 using .Net csom

Steps

Open Visual Studio in your system
Select Console Applciation template and give as name .
Add a Microsoft.Cleint Assembly refrence file in right side refrence tab in visual studio.
Replace Program.cs with the source code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.Social;
namespace EmbedDocumentInPost
{
class Program
{
static void Main(string[] args)
{
// Replace the following placeholder values with the actual values.
const string serverUrl = "http://gauti.sharepoint.com/sp";
const string documentUrl = "http://gauti.sharepoint.com//Shared%20Documents/fileName.docx";
try
{
// Get the context and the SocialFeedManager instance.
ClientContext clientContext = new ClientContext(serverUrl);
SocialFeedManager feedManager = new SocialFeedManager(clientContext);
// Get the document attachment from the server.
ClientResult<SocialAttachment> attachment = feedManager.GetPreview(documentUrl);
clientContext.ExecuteQuery();
// Define properties for the post and add the attachment.
SocialPostCreationData postCreationData = new SocialPostCreationData();
postCreationData.ContentText = "Post with a document.";
postCreationData.Attachment = attachment.Value;
// Publish the post. This is a root post to the user's feed, so specify
// null for the targetId parameter.
feedManager.CreatePost(null, postCreationData);
clientContext.ExecuteQuery();
Console.Write("The post was published.");
Console.ReadLine();
}
catch (Exception ex)
{
Console.Write("Error publishing the post: " + ex.Message);
Console.ReadLine();
}
}
}
}