1. Model:

        using System.ComponentModel.DataAnnotations;

        namespace MVC6App.Data
        {
            //this class will map the database entity. and we will use the byte[] to store the upload file content.
            public class Product
            {
                [Key]
                public int ProId { get; set; }
                public string ProName { get; set; }
                public string ProImageName { get; set; }
                public byte[] ProImageContent { get; set; }

                //you can add another properties
            }

            //this view model is used to collect the data and use the IFormFile to upload file.
            public class ProductViewModel
            {
                public string Name { get; set; }
                public IFormFile FormFile { get; set; }
            }
        }
2. Controller:

        using Microsoft.AspNetCore.Mvc;
        using MVC6App.Data;

        namespace MVC6App.Controllers
        {
            public class ProductController : Controller
            {
                private readonly ApplicationDbContext _dbcontext;
                public ProductController(ApplicationDbContext applicationDbContext)
                {
                    _dbcontext = applicationDbContext;
                }
                public IActionResult Index()
                {
                    var result = _dbcontext.Products.ToList();
                    return View(result);
                }
                public IActionResult Create()
                {
                    return View();
                }
                [HttpPost]
                public async Task<IActionResult> CreateAsync(ProductViewModel product)
                {
                    if (ModelState.IsValid)
                    {
                        //save image to database.
                        using (var memoryStream = new MemoryStream())
                        {
                            await product.FormFile.CopyToAsync(memoryStream);

                            // Upload the file if less than 2 MB
                            if (memoryStream.Length < 2097152)
                            {
                                //Convert the View mdoel to the database entity
                                var file = new Product()
                                {
                                    ProImageName = product.FormFile.FileName,
                                    ProImageContent = memoryStream.ToArray(),

                                    ProName = product.Name
                                };
                                _dbcontext.Products.Add(file);

                                await _dbcontext.SaveChangesAsync();
                            }
                            else
                            {
                                ModelState.AddModelError("File", "The file is too large.");
                            }
                        }
                        return RedirectToAction(nameof(Index));
                    }
                    return View();
                }
            }
        }
3. View page:

        @model MVC6App.Data.ProductViewModel

        @{
            ViewData["Title"] = "Create";
            Layout = "~/Views/Shared/_Layout.cshtml";
        }

        <h1>Create</h1>

        <h4>ProductViewModel</h4>
        <hr />
        <div class="row">
            <div class="col-md-4">
                <form asp-action="Create" enctype="multipart/form-data">
                    <div asp-validation-summary="ModelOnly" class="text-danger"></div>
                    <div class="form-group">
                        <label asp-for="Name" class="control-label"></label>
                        <input asp-for="Name" class="form-control" />
                        <span asp-validation-for="Name" class="text-danger"></span>
                    </div>
                    <div class="form-group">
                        <label asp-for="FormFile" class="control-label"></label>
                        <input asp-for="FormFile" class="form-control" type="file" />
                        <span asp-validation-for="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-action="Index">Back to List</a>
        </div>

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