diff --git a/domain-model.md b/domain-model.md
index 653f474..4e361a9 100644
--- a/domain-model.md
+++ b/domain-model.md
@@ -1 +1,26 @@
-#Domain Models In Here
\ No newline at end of file
+#Domain Models In Here
+EXERCISE 1:
+STORY 1
+As a supermarket shopper, So that I can pay for products at checkout, I'd like to be able to know the total cost of items in my basket.
+
+STORY 2
+As an organised individual, So that I can evaluate my shopping habits, 
+I'd like to see an itemised receipt that includes the name and price of the products I bought as well as the quantity, and a total cost of my basket.
+
+Class Shopper
+
+PROPERTIES:
+double totalCost
+double itemCost
+string itemName
+
+Dictionary<itemName, itemCost> items
+
+METHODS:
+double addCosts(totalCost, itemCost)
+returns:
+totalCost
+
+List<string> createReceipt (Dictionary items, double totalCost) 
+return:
+receipt (First index contains totalCost)
\ No newline at end of file
diff --git a/tdd-domain-modelling.CSharp.Main/Basket.cs b/tdd-domain-modelling.CSharp.Main/Basket.cs
new file mode 100644
index 0000000..2a8a9e5
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/Basket.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace tdd_domain_modelling.CSharp.Main
+{
+    public class Basket 
+    {
+        int totalCost;
+        public Dictionary<string, int> items = new Dictionary<string, int>();
+        public bool addItem(string name, int price)
+        {
+            if (items.ContainsKey(name))
+            {
+                return false;
+            }
+            items[name] = price;
+            totalCost += price;
+            return true;
+        }
+        public int total()
+        {
+            return totalCost;
+        }
+    }
+}
diff --git a/tdd-domain-modelling.CSharp.Main/CohortManager.cs b/tdd-domain-modelling.CSharp.Main/CohortManager.cs
index 6a5669c..4b4b529 100644
--- a/tdd-domain-modelling.CSharp.Main/CohortManager.cs
+++ b/tdd-domain-modelling.CSharp.Main/CohortManager.cs
@@ -8,5 +8,13 @@ namespace tdd_domain_modelling.CSharp.Main
 {
     public class CohortManager
     {
+        public bool search(List<String> cohorts, String name)
+        {
+            foreach(var cohort in cohorts)
+            {
+                if(cohort == name) return true;
+            }
+            return false;
+        }
     }
 }
diff --git a/tdd-domain-modelling.CSharp.Main/Program.cs b/tdd-domain-modelling.CSharp.Main/Program.cs
index 3751555..ecbb05a 100644
--- a/tdd-domain-modelling.CSharp.Main/Program.cs
+++ b/tdd-domain-modelling.CSharp.Main/Program.cs
@@ -1,2 +1,6 @@
 // See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+//Console.WriteLine("Hello, World!");
+
+using tdd_domain_modelling.CSharp.Main;
+//    "Cheese" 60, "Milk" 10, "Eggs" 30, "Potatoes" 15, "Onions" 20
+Basket basket = new Basket();
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diff --git a/tdd-domain-modelling.CSharp.Test/BasketTest.cs b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
new file mode 100644
index 0000000..e58b564
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Test/BasketTest.cs
@@ -0,0 +1,43 @@
+using NUnit.Framework;
+using System;
+using System.Collections;
+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
+    {
+        [TestCase("Cheese", 60)]
+        [TestCase("Milk", 10)]
+        [TestCase("Eggs", 30)]
+        [TestCase("Potatoes", 15)]
+        [TestCase("Onions", 20)]
+        public void testAddToBasket(string item, int price)
+        {
+            //Setup
+            Basket basket = new Basket();
+            //Execute
+            basket.addItem(item, price);
+            //Verify, if the item in the dictionary with the provided key has the same price as the given item it has been properly added.
+            Assert.That(basket.items[item].Equals(price));
+        }
+        [Test]
+        public void testGetTotal()
+        {
+            //Setup
+            Basket basket = new Basket();
+            basket.addItem("Milk", 10);
+            basket.addItem("Potatoes", 15);
+            basket.addItem("Onions", 20);
+            //Execute
+            int total= basket.total();
+            //Verify
+            Assert.That(total.Equals(45));
+        }
+    }
+}
diff --git a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
index 56f3873..3cc66e1 100644
--- a/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
+++ b/tdd-domain-modelling.CSharp.Test/CohortManagerTests.cs
@@ -6,10 +6,17 @@ namespace tdd_domain_modelling.CSharp.Test
     [TestFixture]
     public class CohortManagerTest
     {
-        [Test]
-        public void FirstTest()
+        [TestCase("Name1", true)]
+        [TestCase("Name4", false)]
+        public void FirstTest(string name, bool expectedResult)
         {
+            List<string> cohorts = new List<string>();
+            cohorts.Add("Name1");
+            cohorts.Add("Name2");
+            cohorts.Add("Name3");
             CohortManager core = new CohortManager();
+            bool result = core.search(cohorts, name);
+            Assert.That(result, Is.EqualTo(expectedResult));
         }
     }
 }
\ No newline at end of file