troubleshooting Question

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

Avatar of Olukayode Oluwole
Olukayode OluwoleFlag for Canada asked on
14 Comments2 Solutions170 ViewsLast Modified:
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



Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 2 Answers and 14 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 2 Answers and 14 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros