Create.cshtml:

@page
@model RazorAPP.Pages.File.CreateModel

@{
    ViewData["Title"] = "Create";
}

<h1>Create</h1>

<h4>AppFile</h4>
<hr />
<div class="row">
    <div class="col-md-4">
        <form method="post" enctype="multipart/form-data">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="FileUpload.FormFile" class="control-label"></label>
                <input asp-for="FileUpload.FormFile" class="form-control" type="file" />
                <span asp-validation-for="FileUpload.FormFile" class="text-danger"></span>
            </div> 
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-page="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}



Create.cshtml.cs:

#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using RazorAPP.Data;

namespace RazorAPP.Pages.File
{
    public class CreateModel : PageModel
    {
        private readonly RazorAPP.Data.ApplicationDbContext _context;
        private readonly IWebHostEnvironment _hostenvironment;
        public CreateModel(RazorAPP.Data.ApplicationDbContext context, IWebHostEnvironment webHostEnvironment)
        {
            _context = context;
            _hostenvironment = webHostEnvironment;
        }
        public IActionResult OnGet()
        {
            return Page();
        }
        [BindProperty]
        public FileViewModel FileUpload { get; set; }

        // To protect from overposting attacks, see https://aka.ms/RazorPagesCRUD
        public async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }
            //upload file to folder
            if (FileUpload.FormFile.Length > 0)
            { 
                using (var stream = new FileStream(Path.Combine(_hostenvironment.WebRootPath, "uploadfiles", FileUpload.FormFile.FileName), FileMode.Create))
                {
                    await FileUpload.FormFile.CopyToAsync(stream); 
                } 
            }
            //save image to database.
            using (var memoryStream = new MemoryStream())
            {
                await FileUpload.FormFile.CopyToAsync(memoryStream);

                // Upload the file if less than 2 MB
                if (memoryStream.Length < 2097152)
                {
                    var file = new AppFile()
                    {
                        FileName = FileUpload.FormFile.FileName,
                        Content = memoryStream.ToArray()
                    };
                    _context.File.Add(file);

                    await _context.SaveChangesAsync();
                }
                else
                {
                    ModelState.AddModelError("File", "The file is too large.");
                }
            }
            return RedirectToPage("./Index");
        }
    }
}