从XML文件中读取数据绑定到DropDownList

1 、绑定DropDownList：
    
以下为引用的内容：
ddl_language.DataSource = createDataSource();
    ddl_language.DataTextField = "languageTextField";
    ddl_language.DataValueField = "languageValueField";
    ddl_language.DataBind();
 
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2、上面用到的createDataSource()方法：   45398 www.it55.com it55学习IT知识，享受IT生活 4dfkjn 
以下为引用的内容：
 private ICollection createDataSource()
            {
                  //create a data table to store the data for the ddl_langauge control
                  DataTable dt = new DataTable();
 
                  //define the columns of the table
                  dt.Columns.Add("languageTextField",typeof(string)); 
                  dt.Columns.Add("languageValueField",typeof(string));
 
                  //read the content of the xml file into a DataSet
                  DataSet lanDS = new DataSet();
                  string filePath = ConfigurationSettings.AppSettings["LanguageXmlFile"];
                  lanDS.ReadXml(filePath);
 
                  if(lanDS.Tables.Count > 0) 
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                  { 
                              foreach(DataRow copyRow in lanDS.Tables[0].Rows)
                              {
                                    dt.ImportRow(copyRow);
                            }
                  }
 
                  DataView dv = new DataView(dt); 
 
                  return dv;
            }
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3、Web.config
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以下为引用的内容：
<appSettings>
            <!--The file path for the language type xml file-->
            <addkey="LanguageXmlFile"value="d:\Rhombussolution\Rhombus2\Languages.xml"/>
</appSettings>
 
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 4、Languages.xml   
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以下为引用的内容：
<?xmlversion="1.0"encoding="utf-8"?> 
<languageTypes>
   <language>
      <languageValueField>en-US</languageValueField>
      <languageTextField>English</languageTextField>
   </language>
   <language>
      <languageValueField>zh-CN</languageValueField>
      <languageTextField>中文</languageTextField>
   </language> 
   <language>
      <languageValueField>ja-JP</languageValueField>
      <languageTextField>日语</languageTextField>
   </language>
</languageTypes>  http://www.it55.com/ 
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