select subcategory list inside category list

Question

this is my query for selecting categories and subcategories.

List<Category> lstcat = new List<Category>();

var categ = _db.Category

.Select(c => new Category()

{

PKCatId = c.PKCatId,

CatName = c.CatName,

Icon = c.Icon,

ActiveIcon = c.ActiveIcon,

Subcat = GetChildren(_db, c.PKCatId)

})

.ToList(); 

 

public static List<SubCat> GetChildren(HomeDBContext _db, int parentId)

{

return

_db.subCat.Where(c => c.PKCatId == parentId)

.Select(c => new SubCat

{

PKSubCatId = c.PKSubCatId,

SubCatName = c.SubCatName,

PKCatId = c.PKCatId

})

.ToList();

} 

It gives error like "The entity or complex type 'EcomHomeFurniture.Models.Category' cannot be constructed in a LINQ to Entities query."

can anyone help me to solve this?