Load Data in Serial

program.cs

async static Task Main(string[] args)
{
  var httpClient = new HttpClient();
  httpClient.BaseAddress = new Uri("https://myserver");
  
  using (var fileSource = new StreamReader(File.OpenRead(@"C:\Data\Sources\myfile.csv")))
  {
    await StreamData(fileSource, httpClient, "/api/send");
  }
}

private static async Task StreamData(StreamReader fileSource, HttpClient httpClient, string path)
{
  string line;

  // Read from the file until it's empty
  while ((line = await fileSource.ReadLineAsync()) != null)
  {
    // Convert a line of data into JSON compatible with the API
    var jsonMsg = GetDataJson(line);
    
    // Send it to the server
    await httpClient.PostAsync(path, new StringContent(jsonMsg, Encoding.UTF8, "application/json"));
  }
}