读取App.config出错?为Null值....
app.config:

<?xml   version= "1.0 "   encoding= "utf-8 "   ?>
<configuration>
    <appSettings>
        <add   key= "ConnectionString "   value= "Data   Source=KYLEYUAN;Initial   Catalog=EIP;User   ID=sa "/>
    </appSettings>
</configuration>
=================================

class   test  
{
static     string   cnnString   =   System.Configuration.ConfigurationManager.AppSettings[ "ConnectionString "].ToString();
   
                SqlConnection   cnn   =   new   SqlConnection(cnnString);   ----出错...
 
使用坚视窗口查看：发现System.Configuration.ConfigurationManager.AppSettings[ "ConnectionString "]=null


有添加引用：System.Configuration
请问为何会这样？

------解决方案--------------------
static string cnnString = System.Configuration.ConfigurationManager.AppSettings[ "ConnectionString "].ToString();
不应该这么取连接字符串
------解决方案--------------------
VS 2003
<configuration>
<appSettings>
<add key= "data " value= "Provider=SQLOLEDB;Data Source=.;User ID= " ";PWD= " ";Initial Catalog=iDocument; "> </add>
</appSettings>
string sconn = ConfigurationSettings.AppSettings[ "data "];//获得连接字符串

VS 2005
<appSettings>
<add key= "data " value= "Password=sa;Persist Security Info=True;User ID=sa;Initial Catalog=YinHuaXiaoShouXiTong;Data Source=. "> </add>
</appSettings>
string sconn = ConfigurationSettings.AppSettings[ "data "];//获得连接字符串