asp.net DataTable 修改列值

    /// <summary>
    /// 修改数据表DataTable某一列的类型和记录值(正确步骤：1.克隆表结构，2.修改列类型，3.修改记录值，4.返回结果)
    /// </summary>
    /// <param name="orgDataTable">数据表DataTable</param>
    /// <returns>数据表DataTable</returns>
    private DataTable UpdateDataTable(DataTable orgDataTable)
    {
        DataTable dt = new DataTable();
        //克隆表结构
        dt = orgDataTable.Clone();
        foreach (DataColumn col in dt.Columns)//循环列
        {
            if (col.ColumnName == "Name")
            {
                //修改列类型
                col.DataType = typeof(String);
            }
        }
        foreach (DataRow dr in orgDataTable.Rows)//循环行
        {
            DataRow newdr = dt.NewRow();
            newdr["Account"] = dr["Account"];
            newdr["Name"] = dr["Name"];
            //修改记录值
            newdr["Name"] = ""+dr["Name"];
            dt.Rows.Add(newdr);
        }
        //返回结果
        return dt;
    }