problem : connection to database in c# with LINQ Classes

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C#

database

Hi developers and programmers,

i was create a phone book software with c#
i was create a database with Visual Studio 2012
and i was conneted with LINQ Classes [LINQ to SQL Classes]

when i use in my computer , my software is perfect for working
but when i use in another computers , they have get something error

i was edited app.config

from :

[code]

<configuration>
<configsections>

<connectionstrings>
<add name="test.Properties.Settings.testingConnectionString">
connectionString="Data Source=(localdb)\Projects;Initial Catalog=test-db;Integrated Security=True"
providerName="System.Data.SqlClient" />
<add name="test.Properties.Settings.testingConnectionString1">
connectionString="Data Source=(localdb)\Projects;Initial Catalog=test-db;Integrated Security=True"
providerName="System.Data.SqlClient" />


[/code]

to

[code]

<configuration>
<configsections>

<connectionstrings>
<add name="test.Properties.Settings.testingConnectionString">
connectionString="Data Source=|DataDirectory|;Initial Catalog=test-db;Integrated Security=True"
providerName="System.Data.SqlClient" />
<add name="test.Properties.Settings.testingConnectionString1">
connectionString="Data Source=|DataDirectory|;Initial Catalog=test-db;Integrated Security=True"
providerName="System.Data.SqlClient" />


[/code]


Screen shot and error messages :

[img]http://s1.picofile.com/file/7906626769/Capture.png[/img]

[code]
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.


************** Exception Text **************
System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) ---> System.ComponentModel.Win32Exception (0x80004005): The network path was not found
.....


************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

...........
[/code]


please help me , thanks