Npgsql.Tests.SystemTransactionTests.AssertRowNotExist C# (CSharp) Method

        private void AssertRowNotExist(string columnName, int field_serial)
        {
            using (var conn = OpenConnection())
            using (var cmd = new NpgsqlCommand("select " + columnName + " from data where field_serial = :p0", conn))
            {
                cmd.Parameters.Add(new NpgsqlParameter("p0", field_serial));
                Assert.That(cmd.ExecuteScalar(), Is.Null);
            }
        }