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Editorial Team
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Asked: 2026-05-26T20:43:58+00:00

I am trying to have access to my project from the browser, I have

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I am trying to have access to my project from the browser, I have put it on my server .

My database is on SQL Server 2008 R2 .

When I try to login I have always this exception :

Invalid value for key ‘attachdbfilename’

I think the problem is from my connection string but I can’t fix it . I tried in many ways . 

<connectionStrings>
  <remove name="LocalSqlServer" />
  <add name="LocalSqlServer" 
       connectionString="data source=.\SQLEXPRESS;Initial Catalog=DataUi;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|DataUi.mdf;User Instance=true"
       providerName="System.Data.SqlClient" />
 </connectionStrings>

Can someone help me ?

Thank you very much .

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1 Answer

  1. Editorial Team

    The AttachDbFileName= feature is available ONLY in the SQL Server EXPRESS edition. It is NOT compatible and supported on a “full” SQL Server installation.

    If you have a full SQL Server, you have to attach your database to the SQL Server instance, and then reference it by its (logical) database name – not the physical file name:

    <connectionStrings>
  <add name="LocalSqlServer" 
       connectionString="server=.;database=DataUi;Integrated Security=SSPI;"
       providerName="System.Data.SqlClient" />
 </connectionStrings>
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