C#修改xml文件问题，急求！

[guozili2]

xml文件如下：
<tvbgallery timer="5" order="sequential" >
<image path="images/news1.jpg" targetUrl="http://www.sky4sms.com/smsnews/news/2004-09-03,91,1145,92976828.shtml" wenzi="《金枝欲孽》花旦小生大斗演技"/>
<image path="images/news2.jpg" targetUrl="http://www.sky4sms.com/smsnews/focus/2004-09-09,91,1177,85419906.shtml" wenzi="林峰京港两边走不停"/>
<image path="images/news3.jpg" targetUrl="http://www.sky4sms.com/smsnews/focus/2004-09-01,91,1177,93556187.shtml" wenzi="八月寿星宣萱身先士卒"/>
</tvbgallery>

现在我想修改path和targetUrl属性，怎么搞呢？

[guozili2]

哦，这样啊
但是我想只该一个image结点，后面两个不该

[terryso]

再作个判断啊~~到这里还要问,自己也要想想才会进步啊~~

[ldljlq]

foreach (XmlElement e in xmldoc.DocumentElement.SelectNodes("image"))
{
if(e.Attributes["path"].Value == "......")
{
e.Attributes["path"].Value = e.Attributes["path"].Value + "x";
e.Attributes["targetUrl"].Value = e.Attributes["targetUrl"].Value + "yyyy";
}
}

在循环中加个判断再修改。

[saucer]

XmlElement e = (XmlElement)xmldoc.DocumentElement.SelectSingleNode("image[1]");

or

XmlElement e = (XmlElement)xmldoc.DocumentElement.SelectSingleNode("image[@path='images/news1.jpg']");

[saucer]

using System.Xml;

string FileName = ".....";
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(FileName);
foreach (XmlElement e in xmldoc.DocumentElement.SelectNodes("image"))
{
e.Attributes["path"].Value = e.Attributes["path"].Value + "x";
e.Attributes["targetUrl"].Value = e.Attributes["targetUrl"].Value + "yyyy";
}

xmldoc.Save(FileName);

[guozili2]

我是这样读xml里的数据还是不行
显示错误：System.Xml.XmlException: 给定编码中有无效的字符。 行 6，位置 121。

代码如下：
public class WebForm1 : System.Web.UI.Page
{

string s1,s2,s3;
protected System.Web.UI.WebControls.Label Label1;

private void Page_Load(object sender, System.EventArgs e)
{
XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load(Server.MapPath("images.xml"));
XmlElement e1 = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("image[1]");
XmlElement e2 = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("image[2]");
XmlElement e3 = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("image[3]");

s1=e1.Attributes["path"].Value.ToString();
s2=e2.Attributes["path"].Value.ToString();
s3=e3.Attributes["path"].Value.ToString();


Label1.Text=s1+s2+s3;





}
.......