static void Main(string[] args)

{

    List<int> l = new List<int> { 1, 2, 3, 4};

    Console.WriteLine(l[0].ToString());

    Console.ReadLine();

}

static void Main(string[] args)

{

    List<int> l = new List<int>();

    l.Add(1);

    l.Add(2);

    l.Add(3);

    l.Add(4);

    Console.WriteLine(l[0].ToString());

    Console.ReadLine();

}

.method private hidebysig static void  Main(string[] args) cil managed

{

  .entrypoint

  .maxstack  2

  .locals init ([0] class [mscorlib]System.Collections.Generic.List`1<int32> l,

           [1] class [mscorlib]System.Collections.Generic.List`1<int32> '<>g__initLocal0',

           [2] int32 CS$0$0000)

  IL_0000:  newobj    instance void class [mscorlib]System.Collections.Generic.List`1<int32>::.ctor()

  IL_0005:  stloc.1

  IL_0006:  ldloc.1

  IL_0007:  ldc.i4.1

  IL_0008:  callvirt   instance void class [mscorlib]System.Collections.Generic.List`1<int32>::Add(!0)

  IL_000d:  ldloc.1

  IL_000e:  ldc.i4.2

  IL_000f:  callvirt   instance void class [mscorlib]System.Collections.Generic.List`1<int32>::Add(!0)

  IL_0014:  ldloc.1

  IL_0015:  ldc.i4.3

  IL_0016:  callvirt   instance void class [mscorlib]System.Collections.Generic.List`1<int32>::Add(!0)

  IL_001b:  ldloc.1

  IL_001c:  ldc.i4.4

  IL_001d:  callvirt   instance void class [mscorlib]System.Collections.Generic.List`1<int32>::Add(!0)

  IL_0022:  ldloc.1

  IL_0023:  stloc.0

  IL_0024:  ldloc.0

  IL_0025:  ldc.i4.0

  IL_0026:  callvirt   instance !0 class [mscorlib]System.Collections.Generic.List`1<int32>::get_Item(int32)

  IL_002b:  stloc.2

  IL_002c:  ldloca.s   CS$0$0000

  IL_002e:  call       instance string [mscorlib]System.Int32::ToString()

  IL_0033:  call       void [mscorlib]System.Console::WriteLine(string)

  IL_0038:  call       string [mscorlib]System.Console::ReadLine()

  IL_003d:  pop

  IL_003e:  ret

}

private static void Main(string[] args)

{

    List<int> <>g__initLocal1 = new List<int>();

    <>g__initLocal1.Add(1);

    <>g__initLocal1.Add(2);

    <>g__initLocal1.Add(3);

    <>g__initLocal1.Add(4);

    List<int> l = <>g__initLocal1;

    Console.WriteLine(l[0].ToString());

    Console.ReadLine();

}