Gets data from two database another in asp.net mvc method entity framework

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ASP.NET

MVC

entity-framework

I hope the teachers and you help do.toi are school management software. in this software you have two database is danhmuc.mdf and hocsinh.mdf.which
1: database danhmuc.mdf contains basic information.
2: database hocsinh.mdf contains components handle the learning of students.
I can not get access to retrieve data from database danhmuc through within the database hocsinh.
I write in a language model asp.net MVC3 standard Entity Framework Code First and SQL server.
I hope the teachers and sisters for help.
**File web.config
<connectionstrings>
<add name="ApplicationServices">
connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;U ser Instance=true"
providerName="System.Data.SqlClient" />
<add name="TTTL_HocsinhContext">
connectionString="Data Source=TTTL-PM;Initial Catalog=TTTL_Hocsinh;User ID=sa;Password=...;MultipleActiveResultSets=True;"
providerName="System.Data.SqlClient"/>
<add name="TTTL_DanhmucContext">
connectionString="Data Source=TTTL-PM;Initial Catalog=TTTL_Danhmuc;User ID=sa;Password=...;MultipleActiveResultSets=True;"
providerName="System.Data.SqlClient"/>