// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
 
namespace RazorPagesWebSite.Pages;
 
public class HandlerWithParameterModel : PageModel
{
    public IActionResult OnGet(string testParameter = null)
    {
        if (testParameter == null)
        {
            return BadRequest("Parameter cannot be null.");
        }
 
        return Page();
    }
}