How to get the value of Body of the Discussion board on item Updated in sharepoint 2010.

using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Security;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
using System.Data;
using Microsoft.SharePoint.Administration;

namespace Discuss.EventReceiver1
{
    public class EventReceiver1 : SPItemEventReceiver
    {
        /// <summary>
        /// An item was updated.
        /// </summary>
        public override void ItemUpdated(SPItemEventProperties properties)
        {
            if (properties.ListTitle == "Team Discussion")
            {
                this.DisableEventFiring();
                base.ItemUpdated(properties);
                string Title = string.Empty;
                //Int32 id = Convert.ToInt32(properties.ListItemId);   
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    SPWebApplication webApp = SPWebApplication.Lookup(new Uri(""));
                    {
                        foreach (SPSite site in webApp.Sites)
                        {
                            using (SPWeb web = site.OpenWeb())
                            {
                                try
                                {
                                    SPList listMessageBrd = web.Lists[properties.ListTitle];
                                    SPListItem lstitem = properties.ListItem;
                                    SPListItemCollection lstcoll = web.Lists[properties.ListTitle].Items;
                                    Title = properties.ListItem["Title"].ToString();
                                    SPFieldMultiLineText field = (SPFieldMultiLineText)lstitem.Fields["Body"];
                                    string text = field.GetFieldValueAsText(lstitem["Body"]);

//I am not getting value of body in string text. whenever I take simple multiple line of text column I got body value. but in discussion board it is not working. we got only previous value in body not current value.

                                    SPSiteDataQuery dataQuery = new SPSiteDataQuery();
                                    dataQuery.Webs = "<Webs Scope=\"SiteCollection\">";
                                    dataQuery.Lists = "<Lists ServerTemplate=\"108\" />";
                                    dataQuery.ViewFields = "<FieldRef Name=\"Title\" Nullable=\"TRUE\" Type=\"Text\"/>";
                                    dataQuery.ViewFields = "<FieldRef Name=\"Body\" Nullable=\"TRUE\" Type=\"Text\"/>";
                                    dataQuery.ViewFields = "<FieldRef Name=\"ContentType\"/>";

                                    string where = "";
                                    where = "<Where>";
                                    if (Title != "")
                                    {
                                        where += "<Eq>";
                                        where += "<FieldRef Name=\"Title\"/>";
                                        where += "<Value Type='Text'>" + Title + "</Value>";
                                        where += "</Eq>";
                                    }
                                    where += "</Where>";
                                    dataQuery.Query = where;
                                    DataTable dt = web.GetSiteData(dataQuery);
                                    foreach (DataRow row in dt.Rows)
                                    {
                                        Guid lstid = new Guid(row.ItemArray[0].ToString());
                                        SPList list = web.Lists[lstid];
                                        SPListItem item = list.GetItemById(Convert.ToInt16(row[2]));                                   

SPListItemreply = Microsoft.SharePoint.Utilities.SPUtility.CreateNewDiscussionReply(item);

                                        reply["Body"] = text;
                                        //reply[SPBuiltInFieldId.Body] = (string)lstitem["Body"];                                 
                                        reply.Update();                                     

                                    }

                                }
                                catch (Exception Ex)
                                {
                                    throw Ex;
                                    properties.ErrorMessage = Ex.Message;
                                }
                            }
                        }
                    }
                });
            }

        }
    }
}

please help me or suggest me some Idea.

Thanks

Rajiv Kumar

SharePoint System Analyst

Atos,Pune