string file_path = "data.txt"; /* percorso relativo del file*/
        char[] tokens = new char[1] { char.Parse(";") };
        DataTable dt = new DataTable("tbl_dati");

        System.Collections.Generic.List<string> _rows = new System.Collections.Generic.List<string>();

        using (System.IO.StreamReader rd = new System.IO.StreamReader(Server.MapPath(file_path)))
        {
            while (!rd.EndOfStream)
            {
                _rows.Add(rd.ReadLine());
            }

            rd.Close();
        }


        string[] _columns = _rows[0].Split(tokens);

        int i;

        for (i = 0; i < _columns.Length; i++)
        {
            dt.Columns.Add(new DataColumn(_columns[i]));
        }


        for (i = 1; i < _rows.Count; i++)
        {
            DataRow rw = dt.NewRow();
            string[] _cells = _rows[i].Split(tokens);

            if (_cells.Length > _columns.Length)
            {
                throw new Exception("Numero celle maggiore delle colonne alla riga " + i.ToString());
            }

            int j;

            for (j = 0; j < _cells.Length; j++)
            {
                rw[j] = _cells[j];   
            }

            dt.Rows.Add(rw);
        }



        this.my_grid.DataSource = dt;
        this.my_grid.DataBind();