MarkPflug

using System.Data.SqlClient;

internal class Program
{
    static void Main(string[] args)
    {
        var dbStr = args[0];
        var srcTz = args[1];
        var dstTz = args[2];

MarkPflug

using Npgsql;
using NpgsqlTypes;
using Sylvan.Data.Csv;
using System.Collections.ObjectModel;
using System.Data.Common;

class Program
{
    static async Task Main()
    {

MarkPflug

using CsvHelper;
using nietras.SeparatedValues;
using RecordParser.Extensions;
using Sylvan.Data;
using Sylvan.Data.Csv;
using System.Globalization;
using System.Runtime.CompilerServices;

var tw = new StringWriter();
tw.WriteLine("A,B,C,D");

MarkPflug

AA
AAH
AAHED
AAHING
AAHS
AAL
AALII
AALIIS
AALS
AARDVARK

MarkPflug

using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

sealed class MacOSTextReader : TextReader
{
	readonly TextReader inner;

	public MacOSTextReader(TextReader inner)

MarkPflug

// this is a reworking of the CsvFileResult code posted to the CSharp Reddit:
// https://www.reddit.com/r/csharp/comments/12sip6r/oom_on_custom_fileresult_streaming_from_queryable/

using Microsoft.AspNetCore.Mvc;
using System.Reflection;

public class CSVFileResult<T> : FileResult where T : class
{
    private readonly IQueryable<T> _data;

MarkPflug

// A C# solution to the PowerShell Excel->JSON conversion described in this blog post:
// https://devblogs.microsoft.com/powershell-community/convert-specific-table-of-excel-sheet-to-json/
// Using the Sylvan data libaries.

using Sylvan.Data;
using Sylvan.Data.Excel;

if (args.Length != 3)
{
    Console.WriteLine("Args: file sheet \"class name\"");

MarkPflug

// C# 11 and .NET 6+

using Sylvan.Data;     // 0.2.12-B0001
using Sylvan.Data.Csv; // 1.2.7

// the schema for the csv data below.
var schema =
    new Schema.Builder()
    // ID is required!
    .Add<int>("Id")

MarkPflug

using System.Collections;
using System.Collections.ObjectModel;
using System.Data.Common;
using System.Diagnostics;

var rand = new Random();

var data =
    Enumerable
    .Range(0, 10000000)

MarkPflug

using Sylvan.Data.Excel;

using var r = ExcelDataReader.Create("Data.xlsx");
r.WriteHtmlTable(Console.Out);

static class DataExtensions
{
    public static long WriteHtmlTable(this System.Data.Common.DbDataReader data, TextWriter writer)
    {
        long count = 0;