asp.net - SqlException after moving connection string to web.config -


i have change data source name of server [server name]\sqlexpress after moving connection string page_load web.config. otherwise sqlexception @ con.open(). app works fine both ways wondering why need change datasource name after moving connection string.

    <connectionstrings>         <add name="cs"       connectionstring="data source=[server name]\sqlexpress;  initial catalog = sampledb; integrated security = true"       providername="system.data.sqlclient"/>     </connectionstrings>    (string cs = "data source=.\\sqlexpress; initial catalog = sampledb; integrated security= true";)-moved web.config          string cs = configurationmanager.connectionstrings["cs"].connectionstring;         //pass connection string sqlconnection() constructor         sqlconnection con = new sqlconnection(cs);          //tell sqlcommand query execute , connection         sqlcommand cmd = new sqlcommand("select * electronics", con);          //open connection         con.open();          //execute command         gridview1.datasource = cmd.executereader();         gridview1.databind();          //close connection         con.close();


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