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How can i avoid repeating a connection string already defined in the appconfig file

Last Modified: 2020-01-31
I have a connection string in the appconfig file of my c# application  (see below) that writes to a postgresql database.


    <add name="Tournaments" connectionString="Host =; Database = tournaments; Port = 5432; Username = postgres" />

In the method below that goes into my Database  I have had to repeat the string again  (see below)

[] public class PgrConnector : IDataConnection
        private const string db = "tournaments";
        private const string pgrstring = "Host =; Database = tournaments; Port = 5432; Username = postgres";
        public void ClosePayrollTestRun(MonthPayModel model)
            using (NpgsqlConnection conn = new NpgsqlConnection(pgrstring))

                using (var command = new NpgsqlCommand("public.sppayrollproccesor_closepayrolltestrun", conn))
                    command.CommandType = CommandType.StoredProcedure;

                    //foreach (DataRow row in dataSource.)
                    command.Parameters.Add(new NpgsqlParameter("companycodex", NpgsqlTypes.NpgsqlDbType.Varchar) { Direction = ParameterDirection.Input, Value = LoginDetails.staticcompany });
                    command.Parameters.Add(new NpgsqlParameter("mnthyearx", NpgsqlTypes.NpgsqlDbType.Varchar) { Direction = ParameterDirection.Input, Value = LoginDetails.staticmmyyyy });
                    //  command.Parameters.Add(new NpgsqlParameter("staffnox", NpgsqlTypes.NpgsqlDbType.Varchar) { Direction = ParameterDirection.Input, Value = LoginDetails.staticstaffno });
                    // command.Parameters.Add(new NpgsqlParameter("entcodex", NpgsqlTypes.NpgsqlDbType.Varchar) { Direction = ParameterDirection.Input, Value = LoginDetails.staticentcode });
                    string output = "";
                    output = Convert.ToString(command.ExecuteScalar());
                    LoginDetails.staticpayrollproccesorstatus = output;
                    if (output == "-1")

I want to avoid the repetition by changing

 using (NpgsqlConnection conn = new NpgsqlConnection(pgrstring))

so that it does not use pgrstring  but the connectionstring coming from my Appconfig file

What would the correct syntax  for the using statement


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