关于XML串行化和反串行化的问题!!!急

我在项目文件的web.config文件中添加
<appSettings>
<add key="News_SettingsFile" value="~/Config/News.Config"/>
</appSettings>

该文件指向
<?xml version="1.0"?>
<ModuleSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ConnectionString>server=10.80.162.87;database=NewsRelease;uid=newsadmin;pwd=newsadmin123;</ConnectionString>
<NewsUrl>http://localhost/test/modules/newsmanager/shownews.aspx</NewsUrl>
<AbstractLength>150</AbstractLength>
</ModuleSettings>

test类的GetSettings()方法
public static ModuleSetgings GetSettings()
{
HttpContext context = HttpContext.Current;

ModuleSetgings data = (ModuleSetgings)context.Cache["News_Settings"];
if (data == null)
{
XmlSerializer serializer = new XmlSerializer(typeof(ModuleSetgings));
try
{
string fileName = HttpContext.Current.Server.MapPath(GetSettingsFile());
FileStream fs = new FileStream(fileName, FileMode.Open);
data = (ModuleSetgings)serializer.Deserialize(fs);
fs.Close();
context.Cache.Insert("News_Settings", data, new CacheDependency(fileName));

}
catch (System.IO.FileNotFoundException)
{
data = new ModuleSetgings();
}
}
return data;
}
///////////////////////////////////////////////////////////////////////////
将要串行化的 ModuleSetgings类

public class ModuleSetgings
{
private string connectionString;
private string newsUrl;
private int abstractLength;

[XmlElement]
public string ConnectionString
{
get { return connectionString; }
set { connectionString = value; }
}

[XmlElement]
public string NewsUrl
{
get { return newsUrl; }
set { newsUrl = value; }
}

[XmlElement]
public int AbstractLength
{
get { return abstractLength; }
set { abstractLength = value; }
}

}

我在另一类中调用他们，现在

提示错误：

“/WebSitePut”应用程序中的服务器错误。
--------------------------------------------------------------------------------

不应有 <ModuleSettings xmlns='http://schemas.microsoft.com/.NetConfiguration/v2.0'>。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.InvalidOperationException: 不应有 <ModuleSettings xmlns='http://schemas.microsoft.com/.NetConfiguration/v2.0'>。

源错误:


行 55： string fileName = HttpContext.Current.Server.MapPath(GetSettingsFile());
行 56： FileStream fs = new FileStream(fileName, FileMode.Open);
行 57： data = (ModuleSetgings)serializer.Deserialize(fs);
行 58： fs.Close();
行 59： context.Cache.Insert("News_Settings", data, new CacheDependency(fileName));


源文件: f:\WebSitePut\App_Code\News.Configuration\Configuration.cs 行: 57