1、在web.config文件中加
<configuration>
<appSettings>
<add key="ConnectionString" value="Data Source=(local);Initial Catalog=MyData;User Id=sa;Password=sa;Connect Timeout=180;Enlist=true;Pooling=true;Max Pool Size = 300;Min Pool Size = 5;Connection Lifetime=200;packet size=4096"/>
</appSettings>
</configuration>
<configuration>
<appSettings>
<add key="ConnectionString" value="Data Source=(local);Initial Catalog=MyData;User Id=sa;Password=sa;Connect Timeout=180;Enlist=true;Pooling=true;Max Pool Size = 300;Min Pool Size = 5;Connection Lifetime=200;packet size=4096"/>
</appSettings>
</configuration>
2、添加.Net引用System.Configuration 的Dll
3、声明using System.Configuration;
4、public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
适合于不同工程之间互相调用。