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Editorial Team
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Asked: 2026-06-17T19:55:09+00:00

I’m writing an application in C# and I am using a SQL database too

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I’m writing an application in C# and I am using a SQL database too keep some information. I have defined the database address to make a connection like this:

  @"Data Source=.\SQLEXPRESS;AttachDbFilename=c:\users\pouya\documents\visual studio 2010\Projects\DataBaseDLL\DataBaseDLL\Database.mdf

In this case when I run the application on another computer it causes an error because the address is incorrect.

Is there any way that I can fix this error? For example, making the application look for it in the same folder like ..\\database.mdf?

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1 Answer

  1. Editorial Team

    You should use a relative path to your *.mdf file.

    The following connectionString looks for the mdf file within your App_Data folder. Put this connectionString into your web.config:

    <connectionStrings> 
<add name="YourConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>  
</connectionStrings>

    The |DataDirectory| is doing the trick…

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