diff --git a/tdd-domain-modelling.CSharp.Main/Basket.cs b/tdd-domain-modelling.CSharp.Main/Basket.cs
new file mode 100644
index 0000000..70e7cd0
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/Basket.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Collections;
+
+namespace tdd_domain_modelling.CSharp.Main
+{
+    public class Basket
+    {
+        // Properties
+        public Dictionary<String, int> Items { get; set; }
+
+        //constructor
+        public Basket() 
+        {
+            Items = new Dictionary<String, int>();
+        }
+        //method1, add item to basket
+        public void addToBasket(String productName, int price)
+        {
+            Items.Add(productName, price);
+        
+        }
+        //method2, return the total price
+        public int total() 
+        {
+            List<int> totalValues = Items.Values.ToList();
+            return (totalValues.Sum());
+        }
+    }
+}
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Main/CohortManager.cs b/tdd-domain-modelling.CSharp.Main/CohortManager.cs
index 6a5669c..cd0c07e 100644
--- a/tdd-domain-modelling.CSharp.Main/CohortManager.cs
+++ b/tdd-domain-modelling.CSharp.Main/CohortManager.cs
@@ -8,5 +8,19 @@ namespace tdd_domain_modelling.CSharp.Main
 {
     public class CohortManager
     {
+        // properties
+        public List<string> Cohorts { get; set; }
+
+        public CohortManager()
+        {
+            Cohorts = new List<string> {"Cohort1", "Cohort2", "Cohort3"};
+        }
+
+        public bool isInList(string name) 
+        {
+            return Cohorts.Contains(name);
+        }
+        
     }
+    
 }
diff --git a/tdd-domain-modelling.CSharp.Main/DomainModelReceipt.txt b/tdd-domain-modelling.CSharp.Main/DomainModelReceipt.txt
new file mode 100644
index 0000000..8e56dfd
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/DomainModelReceipt.txt
@@ -0,0 +1,7 @@
+Class Basket:
+Properties
+	-ItemDict<dictionary> (string(itemname), float(prize))
+
+Methods:
+	-totalPrice(); returns the sum of all values (prizes)
+	-list<strings>(); returns unitPrice, quantity, and name(string)
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Main/DomainModelShopper.txt b/tdd-domain-modelling.CSharp.Main/DomainModelShopper.txt
new file mode 100644
index 0000000..fe4071d
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/DomainModelShopper.txt
@@ -0,0 +1,8 @@
+class: Basket
+
+Properties
+- List<String[]> ItemList (string Item, string ItemPrice)
+	
+
+Method: 
+- Int SumOfPrices(returns sum of prices) in ItemList
diff --git a/tdd-domain-modelling.CSharp.Test/BasketTest.cs b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
new file mode 100644
index 0000000..751ab41
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
@@ -0,0 +1,34 @@
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using tdd_domain_modelling.CSharp.Main;
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    [TestFixture]
+    public class BasketTest
+    {
+        [Test]
+
+        public void firstBasketTest()
+        {
+            Basket core = new Basket();
+
+            core.addToBasket("Cola", 2);
+            core.addToBasket("Pepsimax", 3);
+            core.addToBasket("Fanta", 8);
+
+            string[] expectedArray = { "Cola", "Pepsimax", "Fanta" };
+            
+            string[] actualArray = core.Items.Keys.ToArray();
+
+            Assert.AreEqual(expectedArray, actualArray);
+
+            Assert.AreEqual(core.total(), 13);
+
+        }
+    }
+}
diff --git a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
index 56f3873..b08a8de 100644
--- a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
+++ b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
@@ -8,8 +8,15 @@ public class CohortManagerTest
     {
         [Test]
         public void FirstTest()
-        {
+        {   
+            //Arrange
             CohortManager core = new CohortManager();
+
+            
+            string cohortSearch = "Cohort1";
+            bool result = core.isInList(cohortSearch);
+
+            Assert.IsTrue(result);
         }
     }
 }
\ No newline at end of file