Refactor code by Gary

Order.Management/Domain/CustomerInfo.cs

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+using System;
+
+namespace Order.Management.Domain
+{
+    public class CustomerInfo
+    {
+        public string CustomerName { get; set; }
+        public string Address { get; set; }
+        public DateTime DueDate { get; set; }
+
+    }
+}

Order.Management/Domain/OrderInfo.cs

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+using Order.Management.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Order.Management.Domain
+{
+    public class OrderInfo
+    {
+        public int OrderNumber { get; set; }
+        public CustomerInfo CustomerInfo { get; set; }
+        public List<ToyInfo> ToyInfos { get; set; }
+
+        public int GetCountByColor(Color color)
+        {
+            return ToyInfos.Where(item => item.Color.Equals(color)).ToList().Sum(item => item.Quantity);
+        }
+
+        public int GetCountByShape(Enum shape)
+        {
+            return ToyInfos.Where(item => item.Shape.Equals(shape)).ToList().Sum(item => item.Quantity);
+        }
+        public int GetCountByShapeAndColor(Enum shape, Color color)
+        {
+            return ToyInfos.Where(item => item.Shape.Equals(shape) && item.Color.Equals(color)).ToList().Sum(item => item.Quantity);
+        }
+
+        public decimal GetShapePrice(Enum shape)
+        {
+            switch (shape)
+            {
+                case Shape.Triangle:
+                    return ToyPrice.TrianglePrice;
+                case Shape.Circle:
+                    return ToyPrice.CirclePrice;
+                case Shape.Square:
+                default:
+                    return ToyPrice.SquarePrice;
+            }
+        }
+
+        public string ToMessage()
+        {
+            return $"\nName: {CustomerInfo.CustomerName} Address: {CustomerInfo.Address} Due Date: {CustomerInfo.DueDate.ToShortDateString()} Order #: {OrderNumber}";
+        }
+    }
+}

Order.Management/Domain/ToyInfo.cs

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+using Order.Management.Enums;
+
+namespace Order.Management.Domain
+{
+    public class ToyInfo
+    {
+        public Shape Shape { get; set; }
+        public Color Color { get; set; }
+        public int Quantity { get; set; }
+    }
+}

Order.Management/Domain/ToyPrice.cs

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+
+namespace Order.Management.Domain
+{
+    public class ToyPrice
+    {
+        public const decimal SquarePrice = 1;
+        public const decimal TrianglePrice = 2;
+        public const decimal CirclePrice = 3;
+        public const decimal ExtraChargesWithRed = 1;
+    }
+}

Order.Management/Enums/Color.cs

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+namespace Order.Management.Enums
+{
+    public enum Color
+    {
+        Red,
+        Blue,
+        Yellow
+    }
+}

Order.Management/Enums/ReportType.cs

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+using System;
+namespace Order.Management.Enums
+{
+    public enum ReportType
+    {
+        CuttingList,
+        Invoice,
+        Painting
+    }
+}

Order.Management/Enums/Shape.cs

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+namespace Order.Management.Enums
+{
+    public enum Shape
+    {
+        Square,
+        Triangle,
+        Circle
+    }
+}