This is the complete code of how to implement the pagination in the AspNetCore MVC (.NET6) all portions are defined.

PaginationAspCoreMVC6.md

Make a class PaginatedList in Model folder 📂

public class PaginatedList<T> : List<T>
    {
        public int PageIndex { get; private set; }
        public int TotalPages { get; private set; }

        public PaginatedList(List<T> items, int count, int pageIndex, int pageSize)
        {
            PageIndex = pageIndex;
            TotalPages = (int)Math.Ceiling(count / (double)pageSize);

            this.AddRange(items);
        }

        public bool HasPreviousPage => PageIndex > 1;

        public bool HasNextPage => PageIndex < TotalPages;

        public static async Task<PaginatedList<T>> CreateAsync(IQueryable<T> source, int pageIndex, int pageSize)
        {
            var count = await source.CountAsync();
            var items = await source.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToListAsync();
            return new PaginatedList<T>(items, count, pageIndex, pageSize);
        }
    }

Now in Controller Modify the Home Action Like this

public async Task<IActionResult> Index(int pagenumber=1)
     {
         return View(await PaginatedList<Post>.CreateAsync(context.Db_Table,pagenumber,2));
     }

Lets move towards View and add this code on top of the View

@using YourNameSpace.Models
@model PaginatedList<Model>

This is How I designed the Next and Previous buttons in the footer of the page

<!-- Footer -->
 @{
     var prevDisabled = !Model.HasPreviousPage ? "disabled" : "";
     var nextDisabled = !Model.HasNextPage ? "disabled" : "";
 }
<footer class="w3-container w3-dark-grey w3-padding-32 w3-margin-top">
<a class="w3-button w3-black w3-padding-large w3-margin-bottom w3-@prevDisabled" asp-action="Index" asp-route-pagenumber="@(Model.PageIndex-1)">Previous</a>
<a class="w3-button w3-black w3-padding-large w3-margin-bottom w3-@nextDisabled" asp-action="Index" asp-route-pagenumber="@(Model.PageIndex+1)" >Next »</a>

</footer>