Hi I am getting the error could not resolve property: Id of: UCommerce.EntitiesV2.Category in c# coding in ucommerce project

My code is below , Please tell me how can i solve this

For Each CategoryId In brands
                    If CategoryId <> 0 Then
                        Dim ThisCategory = Category.All().SingleOrDefault(Function(x) x.CategoryId = CategoryId)
                        For Each ThisProduct In ThisProducts
                            If CategoryProductRelation.All().Where(Function(x) x.Category.Id = ThisCategory.Id AndAlso x.Product.Id = ThisProduct.Id).Count > 0 AndAlso TempProducts.Where(Function(x) x.Id = ThisProduct.Id).Count = 0 Then
                                TempProducts.Add(ThisProduct)
                            End If
                        Next
                    End If
                Next