NpgsqlConnection conn = null; if (conn == null || conn.State != ConnectionState.Open) { Console.WriteLine("Connection is null or not open"); }
NpgsqlConnection conn = new NpgsqlConnection(connectionString); if (NpgsqlConnection.CheckNull(conn)) { Console.WriteLine("Connection is null"); }In this example, we create a NpgsqlConnection object named conn and pass in a connection string to the constructor. We then use the CheckNull method to check if conn is null. Since conn is not null, nothing is printed. The package library for Npgsql is Npgsql.EntityFrameworkCore.PostgreSQL.