i already have sql database ,server,login,password,,,i have to check from visual studio windows form,,,,to check test connection

Try this connection string

SqlConnection("Data Source=localhost\\SQLEXPRESS;Initial Catalog=DBNAME;Integrated Security=True;Connect Timeout=100;pooling=true; ;User ID=;Password=;Trusted_Connection=Yes");

Do you know how to open a database connection to your database and trap exceptions?

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