I forgot to save Quantity... second push

MCTG/Model/Quantity.cs

@@ -6,7 +6,31 @@ using System.Threading.Tasks;
 
 namespace Model
 {
-    internal class Quantity
+    public class Quantity
     {
+        #region Attributes
+        /// <summary>
+        /// get the quatity of ingredient
+        /// </summary>
+        private int number;
+        /// <summary>
+        /// have the Unit enum of the quantity of ingredient
+        /// </summary>
+        private Unit unit;
+        
+        #endregion
+
+        public int Number
+        {
+            get { return number; }
+            set
+            {
+                if (value <0 )
+                {
+                    throw new ArgumentException("Si la quantité est inférieur à 0, enlever l'ingrédient!");
+                }
+                number = value;
+            }
+        }
     }
 }