included Primitive Obssession pattern example

README.md

@@ -1664,6 +1664,98 @@ Console.WriteLine(employee.GetName());// Employee name: John Doe
 
 </details>
 
+<details>
+ <summary><b>Avoid Primitive Obsession</b></summary>
+
+It is important to differentiate a well-defined object from a lot of loose and repeated attributes in various places.
+
+**Bad:**
+
+```csharp
+ class Person
+ {
+ public string FirstName { get; set; }
+ public string LastName { get; set; }
+ public string Address { get; set; }
+ public string City { get; set; }
+ public string State { get; set; }
+ public string Country { get; set; }
+ public string ZipCode { get; set; }
+ }
+
+ var badPerson = new Person();
+
+ badPerson.FirstName = "John";
+ badPerson.LastName = "Doe";
+ badPerson.Address = "Buck Drive";
+ badPerson.City = "Montpelier";
+ badPerson.State = "Vermont";
+ badPerson.Country = "USA";
+ badPerson.ZipCode = "99999";
+
+ Console.WriteLine($"{badPerson.FirstName} {badPerson.LastName}"); //John Doe
+ Console.WriteLine($"{badPerson.Address}, {badPerson.City}, {badPerson.State}, {badPerson.Country}, {badPerson.ZipCode}"); //Buck Drive, Montpelier, Vermont, USA, 99999
+```
+
+**Good:**
+
+```csharp
+ struct Name
+ {
+ public string FirstName, LastName;
+
+ public Name(string firstName, string lastName)
+ {
+ FirstName = firstName;
+ LastName = lastName;
+ }
+
+ public override string ToString()
+ {
+ return $"{FirstName} {LastName}";
+ }
+ }
+
+ struct Address
+ {
+ public string Street, City, State, Country, ZipCode;
+
+ public Address(string street, string city, string state, string country, string zipCode)
+ {
+ Street = street;
+ City = city;
+ State = state;
+ Country = country;
+ ZipCode = zipCode;
+ }
+
+ public override string ToString()
+ {
+ return $"{Street}, {City}, {State}, {Country}, {ZipCode}";
+ }
+ }
+
+ class Person
+ {
+ public Name Name { get; set; }
+ public Address Address { get; set; }
+ }
+
+ var goodPerson = new Person();
+
+ goodPerson.Name = new Name("John","Doe");
+ goodPerson.Address = new Address("Buck Drive", "Montpelier", "Vermont", "USA", "99999");
+
+ Console.WriteLine($"{goodPerson.Name}"); //John Doe
+ Console.WriteLine($"{goodPerson.Address}"); //Buck Drive, Montpelier, Vermont, USA, 99999
+```
+
+Although we have more code in the second way, we gain from reuse, maintainability and consistency of information.
+
+**[⬆ back to top](#table-of-contents)**
+
+</details>
+
 ## Classes
 
 <details>