How reduce code repitition in the given code?

class TransactionAccess
{
    public static void GetTransactions()
    {
        string connString = "Host=localhost;Username=postgres;Password=1234;Database=ExpenseManagerDB";
        using (var connection = new NpgsqlConnection(connString))
        {
            var transactions = connection.Query<TransactionView>(@"SELECT t.transaction_id,t.account_id,a.account_name, a.type,t.note, t.amount, t.date
                                                               FROM account AS a
                                                               INNER JOIN transaction AS t ON a.account_id = t.account_id");
            transactions.Dump();
        }
    }

    public static void GetTransactionInfo(int id)
    {
        string connString = "Host=localhost;Username=postgres;Password=1234;Database=ExpenseManagerDB";
        using (var connection = new NpgsqlConnection(connString))
        {
            var transactionInfo = connection.Query<TransactionView>(@"SELECT a.account_name, a.type, DATE(t.date), t.amount, t.note, t.transaction_id 
                                                                  FROM transaction AS t 
                                                                  INNER JOIN account AS a ON t.account_id = a.account_id 
                                                                  WHERE t.transaction_id = @id", new { id });
            transactionInfo.Dump();
        }
    }

}

In the above code, I am using connString and connection many times in every function sepeartely. How to reduce and that and use only one connection and connString?