From 5ffc54d57882ba93d20c406e2fa0f8ed3213958e Mon Sep 17 00:00:00 2001
From: EkaterinaAntipova <ekaterina.antipova.99@mail.ru>
Date: Wed, 6 Mar 2019 11:00:39 +0300
Subject: [PATCH 1/3] Update Product.cs

---
 Product.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Product.cs b/Product.cs
index f68c8c9..14b2fd3 100644
--- a/Product.cs
+++ b/Product.cs
@@ -32,11 +32,14 @@ public string Name
             get { return name; }
             set
             {
+                ProductEventArgs args = new ProductEventArgs(name, value);
                 name = value;
                 /* 
                  * TODO #4 Инициировать уведомление об 
                  * изменении наименования
                  */
+                if (NameChanged != null)
+                    NameChanged(this, args);
             }
         }
         /// <summary>
@@ -47,11 +50,14 @@ public decimal Price
             get { return price; }
             set
             {
-                price = value;
                 /*
                  * TODO #5 Инициировать уведомление об 
                  * изменении стоимости
                  */
+                ProductEventArgs args = new ProductEventArgs(price, value);
+                price = value;
+                if (PriceChanged != null)
+                    PriceChanged(this, args);
             }
         }
 
@@ -62,6 +68,8 @@ public decimal Price
         /* 
          * TODO #3 Добавить определение событий
          */
+        public event EventHandler<ProductEventArgs> NameChanged;
+        public event EventHandler<ProductEventArgs> PriceChanged;
 
         #endregion
 

From 413cbe033f848c51dc487fd3ac317efbc6fcc907 Mon Sep 17 00:00:00 2001
From: EkaterinaAntipova <ekaterina.antipova.99@mail.ru>
Date: Wed, 6 Mar 2019 11:02:21 +0300
Subject: [PATCH 2/3] Update ProductEventArgs.cs

---
 ProductEventArgs.cs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/ProductEventArgs.cs b/ProductEventArgs.cs
index a79a6d6..b88872e 100644
--- a/ProductEventArgs.cs
+++ b/ProductEventArgs.cs
@@ -8,11 +8,27 @@
     /*
      * TODO #1 Закончить определение класса ProductEventArgs
      */
-    class ProductEventArgs
+    class ProductEventArgs : EventArgs
     {
         /* 
          * TODO #2 Добавить определение необходимых компонент 
          * класса ProductEventArgs
          */
+        public string Prev_Name { get; }
+        public string New_Name { get; }
+        public decimal Prev_Price { get; }
+        public decimal New_Price { get; }
+
+        public ProductEventArgs(string prev_Name, string new_Name)
+        {
+            Prev_Name = prev_Name;
+            New_Name = new_Name;
+        }
+
+        public ProductEventArgs(decimal prev_Price, decimal new_Price)
+        {
+            Prev_Price = prev_Price;
+            New_Price = new_Price;
+        }
     }
 }

From 5e90b67f72ea646d234fea175c9307069cce60d6 Mon Sep 17 00:00:00 2001
From: EkaterinaAntipova <ekaterina.antipova.99@mail.ru>
Date: Wed, 6 Mar 2019 11:03:58 +0300
Subject: [PATCH 3/3] Update Program.cs

---
 Program.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Program.cs b/Program.cs
index b9247f7..2e27da6 100644
--- a/Program.cs
+++ b/Program.cs
@@ -22,16 +22,33 @@ static void Main(string[] args)
             /* 
              * TODO #6 Назначить обработчики событий в текущем контексте 
              */
+            product.NameChanged += ProductNameChanged;
+            product.PriceChanged += ProductPriceChanged;
 
             /*
              * TODO #7 Выполнить с экземпляром класса Product действия, 
              * приводящие к возникновению описанных Вами событий
              */
+            product.Name = "Product1";
+            product.Name = "NewProduct";
+            product.Price = 5677;
+            product.Price = 678;
         }
 
         /* 
          * TODO #8 Добавить определение обработчиков событий 
          */
+        private static void ProductNameChanged(object sender, ProductEventArgs e)
+        {
+            Product product = sender as Product;
+            Console.WriteLine("Name of {0} has changed to {1}", e.Prev_Name, e.New_Name);
+        }
+
+        private static void ProductPriceChanged(object sender, ProductEventArgs e)
+        {
+            Product product = sender as Product;
+            Console.WriteLine("Price has changed from {0} to {1}", e.Prev_Price, e.New_Price);
+        }
 
     }
 }