List<viewmodel> in view object is returning null - issue

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C#

MVC

I'm working on MVC 5, there is a viewmodel class and contain a virtual list as the same class.

Issue occurred, the problem is filled list is now empty. please help me sir...

I did write:- PartnerProjectVM partnerProjectVM = new PartnerProjectVM();

with out using this new key word how can I access my list? mean, 'partnerProjectVM.listPartnerProjectVM' like this

What I have tried:

Viewmodel,

public class PartnerProjectVM  
   {  
       public int idPartnerProject { get; set; }  
       public string ProjectName { get; set; }  
       public string ProjectDescription { get; set; }  
      public virtual List<PartnerProjectVM> listPartnerProjectVM { get; set; }  
   }  

Get/Post Method,

[HttpPost]  
        public ActionResult PremiumUserRegProjects(PartnerProjectVM partnerProjectVM  
        {  
             partnerProjectVM.listPartnerProjectVM = new List<PartnerProjectVM>();  
                partnerProjectVM.listPartnerProjectVM.Add(partnerProjectVM);  
                return RedirectToAction("PremiumUserRegProjects");  
        }  
          
         [HttpGet]  
        public ActionResult PremiumUserRegProjects()  
        {  
             PartnerProjectVM partnerProjectVM = new PartnerProjectVM();  
             if (partnerProjectVM.listPartnerProjectVM != null && partnerProjectVM.listPartnerProjectVM.Count() > 0)  
            {  
              var lastItemProject = partnerProjectVM.listPartnerProjectVM.LastOrDefault();  
  
                partnerProjectVM.ProjectName = lastItemProject.ProjectName;  
                partnerProjectVM.ProjectDescription = lastItemProject.ProjectDescription;  
                
  
                return View("PremiumUserRegProjects", partnerProjectVM);  
            }  
        }