ADO.NET :: LINQ Multiple Categories For Product?

I'm using Entity Framework.

I have 3 tables:

- Products (Primary key productId)
- Categories (Primary key categoryId)
- Product_to_categories (Table with two fields, CategoryId and ProductId)

One product can be assigned to multiple categories.

How should I download the products from specific category?

Now I retrieve them in that way:

int PageNum = 1;
int PageSize = 10;
int categoryId = 5;
var categoryModel = db.Categories.FirstOrDefault(c => c.CategoryId == categoryId);
var results = (from p in categoryModel.Products select p).Skip((PageNum - 1) * PageSize).Take(PageSize).ToList();

But when there is a lot of products in category my server crushed. I want only 10 products per page.