Pass data from the controller to the view using httppost

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C#

ASP.NET

MVC

ASP.NET-Core

- I had to convert the method in the controller from HttpGet to HttpPost.

- The method returns a view to me.

- I have previously sent values ​​to this method via ViewBag.

- Currently, when I use ViewBag, an error is thrown:

>Failed to load resource: the server responded with a status of 500 (Internal Server Error)

- The error only pops up when I'm using ViewBag


controller:

[HttpPost]
public ActionResult PartialTabelaEcp(string json)
{ 
    var nr_days= 31;
    ViewBag.days= nr_days;
    return PartialView("_TableEve");
}

.cshtml

//for example
@for (int nr_rows = 0; nr_rows < ViewBag.days; nr_rows++)
{
    var nr_names = nr_rows + 1;
}

what I expected?

Help / articles on how to send data from the controller to the view using HttpPost

What I have tried:

for example:
model:

public partial class userDaty_Model
   {
       public int liczbaDniM { get; set; }

       public int numerMiesiacaM { get; set; }

       public int numerRokuM { get; set; }
   }

controler:

liczbaDni = 1;
numerMiesiaca = 2;
numerRoku= 5;

 userDaty_Model userDaty = new userDaty_Model();
            userDaty.liczbaDniM = liczbaDni;
            userDaty.numerRokuM = numerMiesiaca;
            userDaty.numerMiesiacaM = numerRoku;
 return PartialView("_TableEve", userDaty);

and now I have for (razor) and how to throw in it the value assigned in the controller?
view

@for (int nr_rows = 0; nr_rows < @aandWhatWriteHere ; nr_rows++)

I tried:

DayValue : @Html.HiddenFor(item => item.userDaty_Model.liczbaDniM);   // does it works?

@for (int nr_rows = 0; nr_rows <  DayValue; nr_rows++)  // it does not work...