动态添加统计行到DataTable：产品与版本数据统计

 DataTable tblDatas = new DataTable("Datas");
            DataColumn dc = null;
            dc = tblDatas.Columns.Add("Product", Type.GetType("System.String"));
            dc = tblDatas.Columns.Add("Version", Type.GetType("System.String"));
            dc = tblDatas.Columns.Add("Description", Type.GetType("System.String"));
            dc = tblDatas.Columns.Add("Num", Type.GetType("System.Int32"));
            DataRow newRow;
            newRow = tblDatas.NewRow();
            newRow["Product"] = "大话西游";
            newRow["Version"] = "2.0";
            newRow["Description"] = "我很喜欢";
            newRow["Num"] = 50;
            tblDatas.Rows.Add(newRow);
            newRow = tblDatas.NewRow();
            newRow["Product"] = "梦幻西游";
            newRow["Version"] = "3.0";
            newRow["Description"] = "比大话更幼稚";
            newRow["Num"] = 70;
            tblDatas.Rows.Add(newRow);

            int Total = 0;
            string TotalName = string.Empty;
            for (int i = 0; i < tblDatas.Columns.Count; i++)
            {
                Type t = tblDatas.Columns[i].DataType;
                if (!string.IsNullOrEmpty(tblDatas.Columns[i].ColumnName) && tblDatas.Columns[i].DataType.Name == "Int32")
                {
                    for (int j = 0; j < tblDatas.Rows.Count; j++)
                    {
                        Total += int.Parse(tblDatas.Rows[j][tblDatas.Columns[i].ColumnName].ToString());