What is the connection string for localdb for version 11

Question

I m trying to do the Code First Walkthrough of the entity framework   http   blogs msdn com b adonet archive 2011 09 28 ef-4-2-code-first-walkthrough aspx     I have the latest SQL Server Express and when I check my versions available via command line  sqllocaldb info   I see localdbApp1 and v11 0   When I try to run the walkthrough with a few minor tweaks  I get a can t connect error   My app config looks like this    lt parameter value  Server  LocalDB  v11 0  Integrated Security True  MultipleActiveResultSets True    gt    I wrote a simple connection test like below and the code returns the same SQL Connection error   provider  Named Pipes Provider  error  40 - Could not open a connection to SQL Server      new System Data SqlClient SqlConnection  Data Source  LocalDB  v11 0  Integrated Security True  MultipleActiveResultSets True   Open      I ve tried replacing  Data Source      with  Server      but to no avail there   Any ideas what the connection string should be

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I had the same problem for a bit  I noticed that I had   Data Source   localdb  v11 0    Simply by adding one back-slash it solved the problem for me   Data Source   localdb   v11 0

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This is a fairly old thread  but since I was reinstalling my Visual Studio 2015 Community today  I thought I might add some info on what to use on VS2015  or what might work in general   To see which instances were installed by default  type sqllocaldb info inside a command prompt  On my machine  I get two instances  the first one named MSSQLLocalDB   C   gt sqllocaldb info MSSQLLocalDB ProjectsV13   You can also create a new instance if you wish  using sqllocaldb create  some instance name   but the default one will work just fine      if not using a verbatim string literal  don t forget to escape backslashes   Server  localdb  MSSQLLocalDB Integrated Security true

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You need to install Dot Net 4 0 2 or above as mentioned here  The 4 0 bits don t understand the syntax required by LocalDB  See this question here  You can dowload the update here

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I have connection string Server  localdb  v11 0 Integrated Security true Database DB1   and even a  NET 3 5 program connects and execute SQL successfully   But many people say  NET 4 0 2 or 4 5 is required

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In Sql Server 2008 R2 database files you can connect with  Server np     pipe YourInstance tsql query InitialCatalog yourDataBase Trusted Connection True    only  but in sql Server 2012 you can use this      Server  localdb  v11 0 Integrated Security true Database DB1    and it depended on your  mdf  ldf version   for finding programmicaly i use this Method that explained in this post

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I installed the mentioned  Net 4 0 2 update but I got the same error message saying      A network-related or instance-specific error occurred while establishing a connection to SQL Server   I checked the SqlLocalDb via console as follows   C   gt sqllocaldb create  Test  LocalDB instance  Test  created with version 11 0   C   gt sqllocaldb start  Test  LocalDB instance  Test  started   C   gt sqllocaldb info  Test  Name                Test Version             11 0 2100 60 Shared name  Owner               PC TESTUSER Auto-create         No State               Running Last start time     05 09 2012 21 14 14 Instance pipe name  np     pipe LOCALDB B8A5271F tsql query   This means that SqlLocalDb is installed and running correctly  So what was the reason that I could not connect to SqlLocalDB via  Net code with this connectionstring  Server  LocalDB  v11 0 Integrated Security true    Then I realized that my application was compiled for DotNet framework 3 5 but SqlLocalDb only works for DotNet 4 0   After correcting this  the problem was solved

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1  Requires  NET framework 4 updated to at least 4 0 2  If you have 4 0 2  then you should have   HKEY LOCAL MACHINE SOFTWARE Microsoft  NETFramework v4 0 30319 SKUs  NETFramework Version v4 0 2   If you have installed latest VS 2012 chances are that you already have 4 0 2  Just verify first   2  Next you need to have an instance of LocalDb  By default you have an instance whose name is a single v character followed by the LocalDB release version number in the format xx x  For example  v11 0 represents SQL Server 2012  Automatic instances are public by default  You can also have named instances which are private  Named instances provide isolation from other instances and can improve performance by reducing resource contention with other database users  You can check the status of instances using the SqlLocalDb exe utility  run it from command line    3  Next your connection string should look like     Server  localdb   v11 0 Integrated Security true     or   Data Source  localdb   test Integrated Security true     from your code  They both are the same  Notice the two    required because  v and  t means special characters  Also note that what appears after  localdb    is the name of your LocalDb instance  v11 0 is the default public instance  test is something I have created manually which is private    If you have a database   mdf file  already    Server  localdb   Test Integrated Security true AttachDbFileName  myDbFile    If you don t have a Sql Server database    Server  localdb   v11 0 Integrated Security true      And you can create your own database programmatically   a  to save it in the default location with default setting   var query    CREATE DATABASE myDbName      b  To save it in a specific location with your own custom settings      your db name string dbName    myDbName       path to your db files     ensure that the directory exists and you have read write permission  string   files     Path Combine Application StartupPath  dbName     mdf                        Path Combine Application StartupPath  dbName     ldf          db creation query     note that the data file and log file have different logical names var query    CREATE DATABASE     dbName         ON PRIMARY           NAME       dbName     data           FILENAME        files 0                 SIZE   3MB           MAXSIZE   10MB           FILEGROWTH   10             LOG ON           NAME       dbName     log           FILENAME        files 1                 SIZE   1MB           MAXSIZE   5MB           FILEGROWTH   10                 And execute    A sample table can be loaded into the database with something like      CREATE TABLE supportContacts                id int identity primary key           type varchar 20            details varchar 30            INSERT INTO supportContacts     type  details     VALUES      Email    admin sqlfiddle com         Twitter     sqlfiddle        Note that SqlLocalDb exe utility doesnt give you access to databases  you separately need sqlcmd utility which is sad    EDIT  moved position of semicolon otherwise error would occur if code was copy pasted

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This is for others who would have struggled like me to get this working    I wasted more than half a day on a seemingly trivial thing     If you want to use SQL Express 2012 LocalDB from VS2010 you must have this patch installed http   www microsoft com en-us download details aspx id 27756  Just like mentioned in the comments above I too had Microsoft  NET Framework Version 4 0 30319 SP1Rel and since its mentioned everywhere that you need  Framework 4 0 2 or Above  I thought I am good to go     However  when I explicitly downloaded that 4 0 2 patch and installed it I got it working

[c#] What is the connection string for localdb for version 11

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