using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication28
{
    class Program
    {
        static void Main(string[] args)
        {
            ZC heapRef1 = new ZC();
            ZC heapRef2 = new ZC();

            Console.WriteLine(heapRef1);
            Console.WriteLine(heapRef2);
        }
    }

    public struct Z
    {
        public int Val1;
        public float Val2;
        public double Val3;

    }

    public class ZC
    {
        public Z z;

        public ZC()
        {
            z.Val1 = 5;
        }
    }
}

 !dumpheap 
PDB symbol for clr.dll not loaded
 Address       MT     Size
...
02f42548 01153884       24     
02f42560 01153884       24     
...

Statistics:
      MT    Count    TotalSize Class Name
...
01153884        2           48  ConsoleApplication28.ZC 
...

 !do 02f42548  
Name:        ConsoleApplication28.ZC
MethodTable: 01153884
EEClass:     011512f4
Size:        24(0x18) bytes
File:        ...\documents\visual studio 2012\Projects\ConsoleApplication28\ConsoleApplication28\bin\Debug\ConsoleApplication28.exe
Fields:
      MT    Field   Offset                 Type VT     Attr    Value Name
01153840  4000004        4 ...leApplication28.Z  1 instance 02f4254c z

!do 02f42560 
Name:        ConsoleApplication28.ZC
MethodTable: 01153884
EEClass:     011512f4
Size:        24(0x18) bytes
File:        ...\documents\visual studio 2012\Projects\ConsoleApplication28\ConsoleApplication28\bin\Debug\ConsoleApplication28.exe
Fields:
      MT    Field   Offset                 Type VT     Attr    Value Name
01153840  4000004        4 ...leApplication28.Z  1 instance 02f42564 z