Cannot connect from c# to sql locally but can remotely -

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i have c# application want connect sql server , server , application used on same machine , application cannot connect sql if installed application on machine , keeping server in first server connected ! server installed on windows 8.

thanks

please following -

  1. make sure local database server has both windows authentication , sql server authentication mode enabled. but

if using windows authentication change connection string - 

connectionstring="data source=lenovo;initial catalog=app;integrated security=true;"

if using sql server authentication mode, seems since providing username 

connectionstring="data source=lenovo;initial catalog=app;integrated security=false;user id=sa;password=111"

also, app reserve keyword in systems. better avoid such name name of db.

if using default server instance can use . or (local) instead of lenovo


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