c# - A network-related or instance-specific error occurred while establishing a connection to SQL Server. Error Locating Server/Instance Specified) -

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moving web project test enviroment web server made error occur whenever tehre's attempt open connection sql server.

we can insert , read data sql server management studio.

we're suspecting error created bad connection string or sql server using integrated security, haven't been able confirm that.

the connection string.

<connectionstrings> <add name="dsvushort" connectionstring="data source=localhost\sqlexpress;database=ns_survey; integrated security=true;multipleactiveresultsets=true;app=entityframework" /> </connectionstrings>

where used

sqlconnection connection = new sqlconnection(configurationmanager.connectionstrings["dsvushort"].tostring()); connection.open() // pops error

causes error connectionstring in webconfig
set connectionstring in webconfig.
name of connectionstrin in webconfig , code behind must same.

in web.config:

<configuration> <connectionstrings>     <add name="dsvushort" connectionstring="data source=.\sqlexpress;attachdbfilename=|datadirectory|\database.mdf;integrated security=true;user instance=true" providername="system.data.sqlclient"/> </connectionstrings> <system.web>     <compilation debug="true" targetframework="4.0"/> </system.web>

in code:

sqlconnection connection = new sqlconnection(configurationmanager.connectionstrings["dsvushort"].tostring());   connection.open();

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