using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
using System.Xml;
using Microsoft.SharePoint.Utilities;
 
namespace CreateReplyforDiscussionTopic
{
    class Program
    {  
        public static void Main(string[] args)
        {
            using (SPSite site = new SPSite("http://serverName/sites/VJTesting/"))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    SPList list = web.Lists.TryGetList("Team Discussion");
                    if (list != null)
                    {
                        // Get the discussion topic.
                        SPListItem topic = list.GetItemById(9);
                        // Add the Namespace Microsoft.SharePoint.Utilities for SPUtility class.
                        SPListItem reply = SPUtility.CreateNewDiscussionReply(topic);
                        // In the "body" column you can add the HTML content so that you can add images and add the styles for the contents.
                        // To get the HTML content - Go to the "Discussion" list, then click on "Add new Discussion".
                        // In the body column add the contents and images.
                        // In the ribbon interface, click on "Editing Tools" and then click on "Format text" tab.
                        // In the "Markup" group you could see "HTML" option.
                        // Click on the down arrow and then click on "Edit HTML Source".
                        // Copy the HTML source.
                        reply["Body"] = "<div class='ExternalClassF7F26CE68055477797898F1D2250E309'><div class='ExternalClass37FC140BAA764AAD9DAB0F050FD45712' style='color: #ec008c; text-decoration: underline'><p><strong>"My Reply."<img alt='DISCUSS.GIF' src='/sites/VJTesting/SiteAssets/Lists/Team%20Discussion/EditForm/DISCUSS.GIF' style='margin: 5px'/><br/><br/></strong>?</p></div></div>";
                        reply.Update();
                        System.Console.WriteLine("Replied for the topic : "+topic.Title);
                        System.Console.ReadLine();
                    }
                    else
                    {
                        System.Console.WriteLine("List does not exists in the site");
                        System.Console.ReadLine();
                    }
                }
            }           
        }
    }
}