c# - Server Explorer shows both dbContext and database.mdf active -

i may have confused implementation of database asp.net mvc project, have separate data layer connection string pointed .mdf file.

i imported data models through ado.net entity data model code-first existing database.

when go enable migrations, no problem.

however, i'm trying add-migration, , get:

unable generate explicit migration because following explicit migrations pending: [201504081848445_initialcreate].

i checked server explorer, , noticed have both "databasecontext" , database.mdf showing up. sorry if elementary question, suspicion has connection string? saw when first enable , create migrations, show in databasecontext. next day, see "databasecontext" missing _migrationhistory, , see error message explicit migrations pending.

my connection string:

<connectionstrings>     <add name="databasecontext"           connectionstring="data source=(localdb)\v11.0;attachdbfilename=|datadirectory|\database.mdf;integrated security=true;multipleactiveresultsets=true;app=entityframework"           providername="system.data.sqlclient" /> </connectionstrings> 

edit 1 i'm having trouble enabling , updating database migrations. i've re-imported data model code-first, , re-enabled migrations.

i see databasecontext contains table _migrationhistory, , nothing else. .mdf has tables except _migrationhistory.