如何在一个项目中使用多个实体框架连接字符串？

<connectionStrings>
  <add name="Framework1" connectionString="Data Source=Server1;Initial Catalog=Database1;User ID=User1;Password=Pass1" providerName="System.Data.SqlClient" />
  <add name="Framework2" connectionString="Data Source=Server2;Initial Catalog=Database2;User ID=User2;Password=Pass2" providerName="System.Data.SqlClient" />
</connectionStrings>

string connectionString1 = ConfigurationManager.ConnectionStrings["Framework1"].ConnectionString;
string connectionString2 = ConfigurationManager.ConnectionStrings["Framework2"].ConnectionString;