C# Online Compiler | .NET Fiddle

using System;

public class Persoon
{
    public string Achternaam { get; set; }
    public string Voornaam { get; set; }     
    private DateTime _GeboorteDatum;

	public DateTime Geboortedatum
	{
		get { return _GeboorteDatum; }
		set
		{
			if (DateTime.Compare(value, DateTime.Today) != 1)
			{
				_GeboorteDatum = value;
			}
			else
			{
				throw new Exception("De geboortedatum mag niet in de toekomst liggen!");
			}
		}
	}
	
	
	public Persoon()
	{
		Achternaam = "";
		Voornaam = "";
		Geboortedatum = DateTime.Today;
	}
	
	public Persoon(string Achter, string Voor, DateTime Datum)
	{
		Achternaam = Achter;
		Voornaam = Voor;
		Geboortedatum = Datum;
	}
	
	public override string ToString()
	{
	   return Voornaam + " " + Achternaam + " - " + Geboortedatum.ToShortDateString();
	}
}

public class Cursist: Persoon
{
	private int _Cursistnummer;
	public int Cursistnummer
	{
		get { return _Cursistnummer; }
		set
		{
			if (value >= 0)
			{
				_Cursistnummer = value;
			}
			else
			{
				throw new Exception("Geef een positieve waarde in voor het cursistnummer!");
			}
		}
	}
	
	public Cursist()
	{
		Cursistnummer = 0;

	}
	
	public Cursist(int Nummer, string Achter, string Voor, DateTime Datum)
	{
		Cursistnummer = Nummer;
		Achternaam = Achter;
		Voornaam = Voor;
		Geboortedatum = Datum;
	}

	public override string ToString()
	{
	   return Cursistnummer + ": " + Voornaam + " " + Achternaam + " - " + Geboortedatum.ToShortDateString();
	}

}
					
public class Program
{
	public static void Main()
	{
		try{
			Cursist Ik = new Cursist(1, "Linthoudt", "Geert", new DateTime(1969,10,1));
							
			Console.WriteLine(Ik.ToString());
		}
		catch(Exception ex)
		{
			Console.WriteLine(ex.Message);
		}
	}
}

       return Cursistnummer + ": " + Voornaam + " " + Achternaam + " - " + Geboortedatum.ToShortDateString();
 
using System;
​
public class Persoon
{
    public string Achternaam { get; set; }
    public string Voornaam { get; set; }     
    private DateTime _GeboorteDatum;
​
    public DateTime Geboortedatum
    {
        get { return _GeboorteDatum; }
        set
        {
            if (DateTime.Compare(value, DateTime.Today) != 1)
            {
                _GeboorteDatum = value;
            }
            else
            {
                throw new Exception("De geboortedatum mag niet in de toekomst liggen!");
            }
        }
    }
    

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Run-time exception (line 77): Code output limit was exceeded

Stack Trace:

[DotNetFiddle.Infrastructure.LimitExceededException: Code output limit was exceeded]
   at DotNetFiddle.Infrastructure.LimitedStringWriter.ValidateSize() :line 77
   at DotNetFiddle.Infrastructure.LimitedStringWriter.Write(Char[] buffer, Int32 index, Int32 count) :line 34
   at System.IO.TextWriter.Write(Char[] buffer)
   at System.IO.TextWriter.SyncTextWriter.WriteLine(Int32 value)
   at System.Console.WriteLine(Int32 value)
   at Program.Main() :line 10