C#-Error 26- Locating Server/Instance Specified -

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i attempting run program gets data remote sql server, when run program debugger says "error locating server/instance specified"

i searched web , stack overflow , tried many things, nothing worked!

what doing wrong here?

private void txtsearch_click(object sender, eventargs e)     {         sqlconnection conn = new sqlconnection("server=.\\mssqlserver;attachdbfilename = c:\\program files\\microsoft sql server\\mssql11.mssqlserver\\mssql\\data\\education.mdf; database= education;trusted_connection=yes;");         datatable dt = new datatable();         sqldataadapter sda = new sqldataadapter("select * education nationalkey "+ txtnationalkey.text, conn);         sda.fill(dt);         datagridview1.datasource = dt;      }

i tried mssql11,sql express , many other format of string. opened udp port 1434,tcp port 1433 , 7200 too.

.\\ in connection string refer local machine. set ip or machine name of sqlserver machine.


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