public static void CreateMessage(string senderUserName)
        {
            try
            {
                DatabaseAccess.DBConnectionOpen();
                Message message = new Message();

                DatabaseAccess.DBViewUsersforMessage(senderUserName);
                Console.WriteLine("Write the UserName of the receiver for your message!");
                message.ReceiverUserName = Console.ReadLine();

                DatabaseAccess.DBExistentUserToSendMessage(senderUserName, message.ReceiverUserName);

                message.SenderUserName   = senderUserName;
                message.DateOfSubmission = DateTime.Now;
                Console.WriteLine("Write your Message:");
                message.MessageData = Console.ReadLine();


                DatabaseAccess.DBInsertMessage(message.DateOfSubmission, message.SenderUserName, message.ReceiverUserName, message.MessageData);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                DatabaseAccess.DBConnectionClose();
                DatabaseAccess.DBConnectionDispose();
            }
        }