Keep Coding

I'm using Entity framework 6 and I'm developing with DBFirst. In the database I have the following structure
Table : product category -> ProductCategory(ProductCategoryID, Name ...)
Table : product -> Product ( ProductID, ProductCategoryID , ...)
Table : products in -> ShelfProducts(ShelfID, ProductID, ... )
stock location
In my Model I have...
class ShelfProduct
{
...
ShelfID {set;get;}
ProductID {set;get;}
Quantity {set;get;}
...
}
class Product
{
...
string Name {set;get;}
virtual ProductCategory {set;get;}
}
class ProductCategory
{
....
Name {set;get;}
}
I'm binding the ShelfProduct in my datagridview and I'm getting the properties ShelfID, ProductID, Quantity. Also I can show Product's Name using additional binding source with DisplayMember,ValueMember properties as 2nd level binding. But When I try to show in datagridview the ProductCategory.Name I can't do it.
I finded a solution but has ppor performance.
My solution is to add directly in the Model, int the class ShelfProduct a getter property like this
class ShelfProduct
{
...
ShelfID {set;get;}
ProductID {set;get;}
Quantity {set;get;}
...
CategoryName
{
get
{
using(DBContext db = new DBContext)
{
ProductCategory pc = db.ProductCategories.Find(this.Product.ProductCategory.ProductCateogryID);
return pc.Name;
}
}
}
}
But the performance increasing dramatically. Also I can't use int he getter directly return this.Product.ProductCategory.Name ObjectDisposed exception occurs.
How can I do ? Any solution ?