for getting user as well as friends birthday in facebook

for getting user and his friend DOB we have to give user_birthday,friends_birthday in scope. for all scope and permission in facebook you can follow the link:
http://developers.facebook.com/docs/reference/api/permissions/


for getting DOB we can use FQL(facebook querry language) in callback.aspx.cs file:
calback.aspx.cs:
--------------------------------------------------
oAuthFacebook oAuth = new oAuthFacebook();

        if (Request["code"] == null)
        {

            oAuth.AccessTokenGet(Request["code"]);

        }
        else
        {
            try
            {
                oAuth.AccessTokenGet(Request["code"]);
                Api api = new Api(oAuth.Token);
                User u = api.GetUser();
                facebookId = api.UserID;
                fullName = u.first_name + " " + u.last_name;
                email = u.email;
                photoPath = api.GetPictureURL(u.id);

                var arr = api.Fql("SELECT birthday FROM user WHERE uid=" + facebookId);
               
 NOTE: FQL returns JSON object which we can use to get user DOB like arr.JsonObjects[0].Properties["birthday"].ToString();
          
-------------------------------------------------

For getting friend's DOB

IList friends = (IList)api.GetFriends();
            
                foreach (Facebook_Graph_Toolkit.FacebookObjects.NameIDPair pair in friends)
                {
                    friendId = pair.id;
                    friendName = pair.name;
                    var arrFriend = api.Fql("SELECT birthday,email FROM user WHERE uid=" + friendId);
                }