Resolving LINQ Error: Missing Query Pattern Implementation - linq

Question

I am receiving a strange LINQ error when trying to filter a collection in my view.
This is my model:
public class adminEditProductsPricelistProductsVM
{
public Product Product { get; set; }
public PricelistProduct pricelistProduct { get; set; }
}
This is my view:
#using Pp.Lib.Models;
#using System.Linq;
#model PpLib.viewModels.admin.adminEditProductsPricelistProductsVM
#{
//get corresponding PricelistProduct
PricelistProduct thisPP = new ProofPixLib.Models.PricelistProduct();
thisPP = (from x in Model.pricelistProduct where x.ProductId == Model.Product.ProductId select x).FirstOrDefault();
}
the Model.pricelistProduct line is underlined in VS and it says the following error:
Could not find an implementation of the query pattern for source type Pp.Lib.Models.PricelistProduct. 'Where' not found.
Thanks in advance for your help!
UPDATE
As requested - here is the code for the PricelistProduct model.
public partial class PricelistProduct
{
public PricelistProduct()
{
this.PricelistProductOptions = new List<PricelistProductOption>();
}
[ReadOnly(true)]
[Display(Name = "Pricelist Product ID")]
public int PricelistProductId { get; set; }
[ReadOnly(true)]
[Display(Name = "Pricelist ID")]
public int PricelistId { get; set; } //foregin key
public virtual Pricelist Pricelist { get; set; }
[ReadOnly(true)]
[Display(Name = "Product ID")]
public int ProductId { get; set; } //foreign key
public virtual Product Product { get; set; }
[HiddenInput]
public int ProductCategoryId { get; set; } // not a FK but data only
public virtual ProductCategory ProductCategory { get; set; }
[Display(Name = "Use formula")]
private bool _UsesFormula = true;
public bool UsesFormula { get { return _UsesFormula; } set { _UsesFormula = value; } }
private decimal _Price = 0;
public decimal Price { get { return _Price; } set { _Price = value; } }
[Display(Name = "Use discount pricing")]
private bool _HasDiscountPricing = false;
public bool HasDiscountPricing { get { return _HasDiscountPricing; } set { _HasDiscountPricing = value; } }
[Display(Name = "Local shipping price")]
private decimal _LocalShipPrice = 0;
public decimal LocalShipPrice { get { return _LocalShipPrice; } set { _LocalShipPrice = value; } }
[Display(Name = "Intl. shipping price")]
private decimal _IntlShipPrice = 0;
public decimal IntlShipPrice { get { return _IntlShipPrice; } set { _IntlShipPrice = value; } }
[Display(Name = "Item is taxable")]
private bool _isTaxable = true;
public bool isTaxable { get { return _isTaxable; } set { _isTaxable = value; } }
public virtual List<PricelistProductOption> PricelistProductOptions { get; set; }
}

Answer 1

Your PricelistProduct class doesn't implement IEnumerable or IQuerable interfaces, other words it's not a collection to query over it.
Maybe it should be Model.pricelistProduct.PricelistProductOptions in your query or your view model should be a collection?
Consecutive assignments don't make sense as well:
#{
//get corresponding PricelistProduct
PricelistProduct thisPP = new ProofPixLib.Models.PricelistProduct();
thisPP = ..;
}