XML写文件问题

C# code

            string a = "1.jpg";            string b = "第一张图";            string c = "http://www.sina.com.cn/ETicket/Index.aspx?id=100&type=0";            StringBuilder sb = new StringBuilder();            sb.Append("<item item_url='../Advertisment/Image/" + a + "' itemtitle='" + b + "' link='" + c + "' />");            XmlDocument xmlDoc = new XmlDocument();            xmlDoc.LoadXml("<?xml version='1.0' encoding='gb2312'?>" +                            "<bcaster>" +                            sb.ToString() +                            "</bcaster>");            xmlDoc.Save(@"C:\data.xml");

这个会报错。“＝”是意外的标记，标记应为“;”
请大家帮忙看看sb.ToString()是哪里出错了。

[解决办法]
把&转义一下：

C# code

  string a = "1.jpg";            string b = "第一张图";            string c = "http://www.sina.com.cn/ETicket/Index.aspx?id=100&type=0";            StringBuilder sb = new StringBuilder();            sb.Append("<item item_url='../Advertisment/Image/" + a + "' itemtitle='" + b + "' link='" + c + "' />");            XmlDocument xmlDoc = new XmlDocument();            string s = "<?xml version='1.0' encoding='gb2312'?>" +                            "<bcaster>" +                            sb.ToString() +                            "</bcaster>";                        xmlDoc.LoadXml(s);            xmlDoc.Save(@"C:\data.xml");
[解决办法]
string c = "http://www.sina.com.cn/ETicket/Index.aspx?id=100&type=0";
中含有等号，考虑一下转义