C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		var l1=new List<int>{1,2,3,4,5};
		var l2=new List<int>(l1);
		
		l1[0]=99;
		
		Action<int> cw=(i)=>Console.WriteLine(i);
		
		l1.ForEach(cw);
		Console.WriteLine("----------");
		l2.ForEach(cw);
	}
}

 
using System;
using System.Collections.Generic;
                    
public class Program
{
    public static void Main()
    {
        var l1=new List<int>{1,2,3,4,5};
        var l2=new List<int>(l1);
        
        l1[0]=99;
        
        Action<int> cw=(i)=>Console.WriteLine(i);
        
        l1.ForEach(cw);
        Console.WriteLine("----------");
        l2.ForEach(cw);
    }
}

Unhandled exception. System.InvalidCastException: Invalid cast from 'System.Int32' to 'System.Nullable`1[[System.Int32, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]'.
   at System.Convert.DefaultToType(IConvertible value, Type targetType, IFormatProvider provider)
   at Program.GetValueBad[T]()
   at Program.Main()
Command terminated by signal 6

Last Run:	7:42:32 am
Compile:	0.008s
Execute:	0.16s
Memory:	5.59Mb
CPU:	0.168s

View IL Code