读取数据库配置方法

在web.config中
<connectionStrings>

  <add name="AppConnectionString1" connectionString="server=localhost;database=northwind;uid=sa;password=xxxx;"/>
 </connectionStrings>

在程序中如下读取：
  SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AppConnectionString1"].ConnectionString);

GETSECTION方法：
 ConfigurationManager.GetSection("mySection")

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具体写法

public static string connectionString = ConfigurationManager.ConnectionStrings["SperConnectionString1"].ToString();