C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Threading;
using System.Threading.Tasks;
					
public class Program
{
	static async Task Error() => await Task.FromException(new Exception("error"));
	static async Task<int> Success() => await Task.FromResult<int>(42);
	static async Task<int> SuccessDelay()
	{
		Thread.Sleep(100);
		return await Task.FromResult<int>(42);
	}
	
	static async Task ErrorDelay()
	{
		Thread.Sleep(100);
		await Task.FromException(new Exception("error"));
	}
	
	public static async Task Main()
	{
		Console.WriteLine("Hello World");
		var t1 = Error();
		var t2 = Success();
		var t3 = SuccessDelay();
		var t4 = ErrorDelay();
		
		try
		{
		/*
		await t1;
		await t2;
		await t3;
		await t4;
		*/
		
		//Task.WaitAll(t1,t2,t3,t4);
		
		await Task.WhenAll(t1,t2,t3,t4);
		}
		catch (Exception) { Console.WriteLine("Exception caught");}
		
		//time for all tasks to end
		Thread.Sleep(200);
		
		Console.WriteLine("end");
	}
}

 
using System;
using System.Threading;
using System.Threading.Tasks;
                    
public class Program
{
    static async Task Error() => await Task.FromException(new Exception("error"));
    static async Task<int> Success() => await Task.FromResult<int>(42);
    static async Task<int> SuccessDelay()
    {
        Thread.Sleep(100);
        return await Task.FromResult<int>(42);
    }
    
    static async Task ErrorDelay()
    {
        Thread.Sleep(100);
        await Task.FromException(new Exception("error"));
    }
    
    public static async Task Main()
    {
        Console.WriteLine("Hello World");
        var t1 = Error();
        var t2 = Success();
        var t3 = SuccessDelay();
        var t4 = ErrorDelay();
        
        try
        {
        /*
        await t1;
        await t2;
        await t3;
        await t4;
        */
        
        //Task.WaitAll(t1,t2,t3,t4);
        
        await Task.WhenAll(t1,t2,t3,t4);
        }
        catch (Exception) { Console.WriteLine("Exception caught");}
        
        //time for all tasks to end
        Thread.Sleep(200);
        
        Console.WriteLine("end");
    }
}

QuoteRequest { symbol = GOOG, from = 01/01/2004 00:00:00, to = 12/31/2019 00:00:00, interval = 1d }
https://query1.finance.yahoo.com/v7/finance/download/GOOG?period1=1072915200&period2=1577750400&interval=1d&events=history
status = Unauthorized
97 bytes

QuoteRequest { symbol = MSFT, from = 01/01/2004 00:00:00, to = 12/31/2019 00:00:00, interval = 1d }
https://query1.finance.yahoo.com/v7/finance/download/MSFT?period1=1072915200&period2=1577750400&interval=1d&events=history
status = Unauthorized
97 bytes

QuoteRequest { symbol = INTC, from = 01/01/2004 00:00:00, to = 12/31/2019 00:00:00, interval = 1d }
https://query1.finance.yahoo.com/v7/finance/download/INTC?period1=1072915200&period2=1577750400&interval=1d&events=history
status = Unauthorized
97 bytes

QuoteRequest { symbol = AMZN, from = 12/01/2004 00:00:00, to = 12/31/2019 00:00:00, interval = 1d }
https://query1.finance.yahoo.com/v7/finance/download/AMZN?period1=1101859200&period2=1577750400&interval=1d&events=history
status = Unauthorized
97 bytes

QuoteRequest { symbol = IBM, from = 12/01/2004 00:00:00, to = 12/31/2019 00:00:00, interval = 1d }
https://query1.finance.yahoo.com/v7/finance/download/IBM?period1=1101859200&period2=1577750400&interval=1d&events=history
status = Unauthorized
97 bytes

Cached Result
Last Run:	9:38:20 am
Compile:	0.023s
Execute:	2.15s
Memory:	40.40Mb
CPU:	2.173s

View IL Code