public static void Process() { try { string hackertxt = "E:\\excel\\hack" + Guid.NewGuid().ToString() + ".txt"; string projecttxt = "E:\\excel\\project" + Guid.NewGuid().ToString() + ".txt"; //GetHackersFromApi(); DateTime startTime = DateTime.Now; Console.WriteLine("Starting Conversion " + startTime); tempFileSheet1 = (Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString())) + "data1"; tempFileSheet2 = (Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString())) + "data2"; ExcelToCSVCoversion(@"E:\excel\Input\20180725.xlsx"); CsvHelper.CsvReader csvReader = new CsvHelper.CsvReader(File.OpenText(tempFileSheet1 + ".csv")); csvReader.Read(); csvReader.ReadHeader(); List <Hacker> hackers = new List <Hacker>(); while (csvReader.Read()) { var hack = new Hacker(); hack.alias = csvReader.GetField("alias"); hack.Upn = csvReader.GetField("email"); hack.city = csvReader.GetField("hb_city"); hack.country = csvReader.GetField("hb_country"); hack.name = csvReader.GetField("PreferredFirstName"); hack.officeLocation = csvReader.GetField("Bldg").Replace("N/A", ""); hack.Registered_On = csvReader.GetField <DateTime>("registration_date"); hackers.Add(hack); } csvReader = new CsvHelper.CsvReader(File.OpenText(tempFileSheet2 + ".csv")); csvReader.Read(); csvReader.ReadHeader(); List <Project> projects = new List <Project>(); while (csvReader.Read()) { var hack = new Project(); hack.id = csvReader.GetField <int>("id"); hack.hackathon_name = csvReader.GetField("hackathon_name"); hack.description = csvReader.GetField("description"); hack.members = csvReader.GetField("members"); hack.tagline = csvReader.GetField("tagline"); hack.title = csvReader.GetField("title"); hack.venue = csvReader.GetField("venue"); projects.Add(hack); } Console.WriteLine("Conversion Completed " + (DateTime.Now - startTime)); List <int> pids = new List <int>(); pids.Add(70766); pids.Add(72814); pids.Add(72117); projects = projects.Where(cc => pids.Contains(cc.id)).ToList(); //Task addorUpdateusers = Task.Factory.StartNew(() => { AddOrUpdateProject(projects); }); //AddOrUpdateProject(projects); //Task addorregisteredusers = Task.Factory.StartNew(() => { AddRegisteredUsers(hacker); }); //AddRegisteredUsers(hacker); File.WriteAllText(hackertxt, Newtonsoft.Json.JsonConvert.SerializeObject(hackers)); File.WriteAllText(projecttxt, Newtonsoft.Json.JsonConvert.SerializeObject(projects)); UserRegistration.AddRegisteredUsers(hackers); ProjectRegistration.AddOrUpdateProject(projects); //Task.WaitAll(addorUpdateusers, addorregisteredusers); Console.WriteLine("Entire Process Completed " + (DateTime.Now - startTime)); Console.WriteLine("Start time " + DateTime.Now); } catch (Exception ex) { Console.WriteLine(ex); } }