commiting errors

LuminousSales/Business/Businesses/ProductBusiness.cs

@@ -0,0 +1,65 @@
+using System.Collections.Generic;
+using System.Linq;
+using Business.Businesses;
+using Models.Models;
+
+
+namespace Business.Businesses
+{
+    public class ProductBusiness
+    {
+        private ProductContext productContext;
+
+        public List<Product> GetAll()
+        {
+            using (productContext = new ProductContext())
+            {
+                return productContext.Products.ToList();
+            }
+        }
+
+        public Product Get(int id)
+        {
+            using (productContext = new ProductContext())
+            {
+                return productContext.Products.Find(id);
+            }
+        }
+
+        public void Buy(Product product)
+        {
+            using (productContext = new ProductContext())
+            {
+                productContext.Products.Add(product);
+                productContext.SaveChanges();
+            }
+        }
+
+        public void Update(Product product)
+        {
+            using (productContext = new ProductContext())
+            {
+                var item = productContext.Products.Find(product.Id);
+                if (item != null)
+                {
+                    productContext.Entry(item).CurrentValues.SetValues(product);
+                    productContext.SaveChanges();
+                }
+            }
+        }
+
+        public void Sell(int id)
+        {
+            using (productContext = new ProductContext())
+            {
+                var product = productContext.Products.Find(id);
+                if (product != null)
+                {
+                    productContext.Products.Remove(product);
+                    productContext.SaveChanges();
+                }
+            }
+        }
+
+    }
+}