How do I put this namespace in my project to display products in listviwe?

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1.00/5 (1 vote)

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C#

using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WingtipToys.Models;>>>>>>>>>.This is my problem, the program shows that it does not exist in namespace.

using System.Web.ModelBinding;
using System.Web.Services.Description;




namespace RentingCarV2
{
    public partial class ProductList : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public IQueryable<Product> GetProducts([QueryString("id")] int? categoryId)
        {
            var _db = new WingtipToys.Models.ProductContext();
            IQueryable<Product> query = _db.Products;
            if (categoryId.HasValue && categoryId > 0)
            {
                query = query.Where(p => p.CategoryID == categoryId);
            }
            return query;

        }
    }
}

What I have tried:

I searched for the namespace in my project but couldn't find it

Posted 29-Jul-22 13:07pm

TEEF. ALHARBI

Updated 29-Jul-22 18:48pm

PIEBALDconsult

v2

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PIEBALDconsult 29-Jul-22 19:16pm

Add a reference?

Afzaal Ahmad Zeeshan 29-Jul-22 19:17pm

You need to add the reference to your project. Depending on your .NET version and the availability of the package, you might have to do that either via UI or via the CLI.

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OriginalGriff · Answer 1 · 2022-07-29T18:48:00

The using statement creates a "shortcut" which allows you to use a class without specifying it's full name. YOu don't have to use them, but ...

C#

using System;
using System.IO;	
using System.Collections.Generic;

public class Program
	{
	static void Main(string[] args)
		{
		List<string> myList = new List<string>();
		...
		Console.ReadLine();
		}
	}

Is a lot more readable than:

C#

using System;
using System.IO;					
public class Program
	{
	static void Main(string[] args)
		{
		System.Collections.Generic.List<string> myList = new System.Collections.Generic.List<string>();
		...
		Console.ReadLine();
		}
	}

But in order to use a class from an assembly (and apart from the very basic value types everything is in an assembly of some form) it has to be added to the project by adding a reference to that assembly to the project: Manage references in a project - Visual Studio (Windows) | Microsoft Docs[^]