/// <summary>
/// Get from database all messages related of the user (current user and other users who have conversed with the current user)
/// </summary>
/// <param name="userId"></param>
/// <returns></returns>
private List <Message> GetListMessagesForUser(int userId)
{
var list1 = MessageComponent.GetMessages(UserInfo.UserID, userId).ToList();
var list2 = MessageComponent.GetMessages(userId, UserInfo.UserID).ToList();
var listFinallyMessages = list1.Concat(list2).OrderBy(p => p.DateCreated).ToList();
return(listFinallyMessages);
}