string [] an = {"a","b","c"};
DataTable dt = new DataTable();
            dt.Columns.Add("Number");
            froeach(string var in an)
            {
                DataRow r = dt.NewRow();
                r["Number"] = var;
                dt.Rows.Add(r);
            }
DataSet ds = new DataSet();
            ds.Tables.add(dt);