读取数据库 生成Xml节点

 foreach (DataColumn v in dt.Columns)
            {
                sb.Append("sb.Append("<" + v.ColumnName.ToUpper() + ">");
");
                sb.Append("sb.Append(info." + v.ColumnName + ");
");
                sb.Append("sb.Append("</" + v.ColumnName.ToUpper() + ">");
"); 
            }