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There is not a runtime error, only it occurs on the page itself. When I try to enter a decimal price on input field, there is a warning on the page.

View:

<div class="form-group row">
        <div class="col-4">
        </div>
        <div class="col-8">
            @if (product != null)
            {
                <button type="submit" class="btn btn-danger form-control" asp-action="Remove" asp-route-id="@Model.Id">
                    Remove to Cart
                </button>
            }
            else
            {
                <input type="submit" class="btn btn-info form-control" value="Add to Cart" />
            }

        </div>

    </div>
</div>

Controller:

public ActionResult Detail(int? id)
 {
     if (id == null)
     {
         return NotFound();
     }
     var product=_db.Products.Include(c=>c.ProductTypes).FirstOrDefault(c=>c.Id == id);
     {
         if (product == null)
         {
             return NotFound();
         }
     }
     return View(product);
 }

Model:

public class Product
{
    public int Id { get; set; }

    [Required]

    public string? Name { get; set; }
    [Required]

    public decimal? Price { get; set; } 

  

    public string? Image {  get; set; }

    [Display(Name ="Product Color")]

    public string? ProductColor { get; set; }

    [Required]
    [Display(Name ="Available")]

    public bool IsAvailable { get; set; }
    [Display(Name ="Product Type")]
    [Required]
    public int ProductTypeId {  get; set; }
    [ForeignKey("ProductTypeId")]

    public ProductTypes? ProductTypes { get; set; }
}

I thought to delete the nullable sign of price “decimal” in models, but it will change all of the order in migration. What are the possible other solutions for that?