C#:

namespace StructTest
{
	public struct Foo
	{
		public int x;
		public int y;

		public Foo(int z)
		{
			x = z;
			y = 0;
		}
	}

	public static class Bar
	{
		public static void Main(string[] args)
		{
			Foo foo = new Foo();
			foo.x = 0;
		}
	}
}

-------------------------------------------------------------------------------------------------------

IL:

.assembly extern mscorlib
{
  .ver 2:0:0:0
  .publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
}
.assembly 'struct'
{
  .custom instance void class [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::'.ctor'() =  (
		01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78   // ....T..WrapNonEx
		63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01       ) // ceptionThrows.

  .hash algorithm 0x00008004
  .ver  0:0:0:0
}
.module struct.exe // GUID = {853E4289-AEAF-4156-97DC-25BE65E70FB1}


.namespace StructTest
{
  .class public sequential ansi sealed beforefieldinit Foo
  	extends [mscorlib]System.ValueType
  {
    .field  public  int32 x
    .field  public  int32 y

    // method line 1
    .method public hidebysig  specialname  rtspecialname
           instance default void '.ctor' (int32 z)  cil managed
    {
        // Method begins at RVA 0x20ec
	// Code size 15 (0xf)
	.maxstack 8
	IL_0000:  ldarg.0
	IL_0001:  ldarg.1
	IL_0002:  stfld int32 StructTest.Foo::x
	IL_0007:  ldarg.0
	IL_0008:  ldc.i4.0
	IL_0009:  stfld int32 StructTest.Foo::y
	IL_000e:  ret
    } // end of method Foo::.ctor

  } // end of class StructTest.Foo
}

.namespace StructTest
{
  .class public auto ansi abstract sealed beforefieldinit Bar
  	extends [mscorlib]System.Object
  {

    // method line 2
    .method public static  hidebysig
           default void Main (string[] args)  cil managed
    {
        // Method begins at RVA 0x20fc
	.entrypoint
	// Code size 17 (0x11)
	.maxstack 2
	.locals init (
		valuetype StructTest.Foo	V_0)
	IL_0000:  ldloca.s 0
	IL_0002:  initobj StructTest.Foo
	IL_0008:  ldloca.s 0
	IL_000a:  ldc.i4.0
	IL_000b:  stfld int32 StructTest.Foo::x
	IL_0010:  ret
    } // end of method Bar::Main

  } // end of class StructTest.Bar
}