asp。net连接mysql数据库字符串连接不上

XML code

<add key="SqlString" value=" Server=127.0.0.1;Database=dbtraffic;Uid=root;Pwd=1"/>

连接不上在网上找的一些例子都不行，这个连接没有提示错误。就是不显示数据在网页上

C# code

string con = ConfigurationManager.ConnectionStrings["SqlString"].ConnectionString;                using (MySqlConnection cn = new MySqlConnection(con))

这样连接不上

C# code

  using (MySqlConnection cn = new MySqlConnection("server=localhost;user id=root;password=1;database=dbtraffic"))

这样就可以连接的上，求大神

[解决办法]
string con =System.Configuration.ConfigurationManager.AppSettings["SqlString"];
[解决办法]
举例：

MySql.Data.MySqlClient.MySqlConnection conn = new MySqlConnection();

conn.ConnectionString = ConfigurationManager.ConnectionStrings["dlxjConnectionString"].ConnectionString;



[解决办法]
注意connectionStrings和appSettings配置节的区别

C# code

<appSettings>   <add key="SqlString" value=" Server=localhost;Database=dbtraffic;Uid=root;Pwd=1"/></appSettings>string con = ConfigurationManager.AppSettings["SqlString"];using (MySqlConnection cn = new MySqlConnection(con)){    //...}