using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;

namespace BookShop.Models
{
public partial class BookShopDBDataContext
{
//return all categories
public List GetAllCategory()
{
return Categories.ToList();
}

//Add Category
public void AddCategory(Category c)
{

this.Categories.InsertOnSubmit(c);
this.SubmitChanges();
}

//Edit Category
public void EditCategory(Category c)
{

this.UpdateCategory(c);
this.SubmitChanges();
}

public Category GetCategory(int id)
{
return Categories.Single(c => c.CategoryId == id);
}

//delete category
public bool DelCategory(int id)
{

//check if has used
if (Books.Any(b => b.BookCategoryId == id))
{
return false;
}
else
{
Category delCategory = this.Categories.Single(c => c.CategoryId == id);
this.Categories.DeleteOnSubmit(delCategory);
this.SubmitChanges();
return true;
}
}
}
}