我想问下在C#winform中下面的那段代码用于什么时候，什么意思

我想问下在C#winform中下面的那段代码用于什么时候，什么意思

 if (File.Exists(dbPath))//
                {
                    string sq = @"Data Source=" + dbPath;
                    m = new SQLiteConnection(sq);
                    m.Open();
                    string sql = "select * from sqlite_master where type='table' and name ='因素'";
                    SQLiteCommand command = new SQLiteCommand(sql, m);//
                    if (command.ExecuteScalar() == null)//
                    {
                        m.Close();
                        NewTable1(dbPath, "因素");
                        AddcailiaoPara1(dbPath, "因素");
                    }
                    else
                    {
                        m.Close();
                        AddcailiaoPara1(dbPath, "因素");
                    }