public void AddDefaults()
        {
            Grid grid_0 = new Grid {
                t_begin = 0f, t_step = 0f, count = 0
            };
            V1DataOnGrid tmp_0 = new V1DataOnGrid("information", DateTime.Now, grid_0);

            Add(tmp_0);
            V1DataCollection tmp_1 = new V1DataCollection("information", DateTime.Now);

            Add(tmp_1);
            Random rand = new Random();
            int    k    = 2;

            for (int i = 0; i < k; i++)
            {
                string   info = "information";
                DateTime date = DateTime.Now;
                Grid     grid = new Grid {
                    t_begin = 0f, t_step = 5f, count = 2
                };
                float        rand_minValue = (float)(-rand.NextDouble() * 20f);
                float        rand_maxValue = (float)(rand.NextDouble() * 30f);
                V1DataOnGrid tmp           = new V1DataOnGrid(info, date, grid);
                tmp.InitRandom(rand_minValue, rand_maxValue);
                Add(tmp);
                V1DataCollection tmp2           = new V1DataCollection(info, date);
                float            rand_minValue2 = (float)(-rand.NextDouble() * 20f);
                float            rand_maxValue2 = (float)(rand.NextDouble() * 30f);
                float            rand_tmin      = (float)(rand.NextDouble() * 10f);
                float            rand_tmax      = rand_tmin + (float)(rand.NextDouble() * 30f);
                tmp2.InitRandom(2, rand_tmin, rand_tmax, rand_minValue2, rand_maxValue2);
                Add(tmp2);
            }
        }
        static void Main(string[] args)
        {
            //Console.WriteLine("Start");
            V1DataOnGrid Obj1 = new V1DataOnGrid("input.txt");

            V1MainCollection Obj2 = new V1MainCollection();

            Obj2.DataChanged += DataChangedInList;
            Obj2.AddDefaults();
            Obj2.Add(Obj1);
            Obj2[2]   = Obj1;
            Obj1.info = "new_information";
            Obj2.Remove(Obj1.info, Obj1.date);
        }