از این کد میتونید ایده کانکشن استرینگ رو بگیری
private static void OpenSqlConnection(){ string connectionString = GetConnectionString(); using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); Console.WriteLine("State: {0}", connection.State); Console.WriteLine("ConnectionTimeout: {0}", connection.ConnectionTimeout); }}static private string GetConnectionString(){ // To avoid storing the connection string in your code,// you can retrieve it from a configuration file, using the// System.Configuration.ConfigurationSettings.AppSett ings propertyreturn"Data Source=(local);Initial Catalog=AdventureWorks;" + "Integrated Security=SSPI;Connection Timeout=30";}