connection string - ASP.NET Invalid value for key 'attachdbfilename' -

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the next error pops when initialize sqlconnection object:

invalid value key 'attachdbfilename'.

i have tried solve issue hours (also tried of advices find on so), no success.

this connection string:

data source=(localdb)\v11.0;attachdbfilename=|datadirectory|users.mdf;integrated security=true

users.mdf located in app_data folder.

i using visual studio 2012 ultimate, .net ver 4.5, sql server 2012. issue started after formatted main driver, , installed software mentioned above.

thanks, guy

that seems connection string sql server express edition.

do have express edition installed on dev machine?

i faced same issue , workaround create database named users in non-express edition of sql server.

assuming have non-express edition installed, need attach existing users.mdf sql server database. http://www.sqlservercentral.com/forums/topic590254-360-1.aspx

connection string: server=localhost;database=newdatabasename;user id=myusername;password=mypassword;

http://www.connectionstrings.com/sql-server-2008


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