diff --git a/domain-model.md b/domain-model.md
index 653f474..9bc4888 100644
--- a/domain-model.md
+++ b/domain-model.md
@@ -1 +1,19 @@
-#Domain Models In Here
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+#Domain Models In Here
+
+Class Item
+
+	- string itemName
+	- double price
+
+
+class Basket
+
+	PROPERTIES
+	- public List<item> items;
+
+
+	METHODS
+	- public bool addItemsToBasket(string itemName, double price)
+	- public double totalCosts
+	- List printReceipt string, prints each itemName, price and quantity of item & total price
+	
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diff --git a/tdd-domain-modelling.CSharp.Main/Basket.cs b/tdd-domain-modelling.CSharp.Main/Basket.cs
new file mode 100644
index 0000000..4472136
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Main/Basket.cs
@@ -0,0 +1,40 @@
+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
+    {
+        public Dictionary<string, double> items = new Dictionary<string, double>(); 
+
+        public Basket()
+        {
+
+        }
+
+        public bool addItemsToBasket(string itemName, double price)
+        {
+            // if itemName is not in items Dicionary, add itemName and Price to items Dicionary
+            if (!items.ContainsKey(itemName))
+            {
+                items.Add(itemName, price);
+                return true;
+            }
+            return false;
+        }
+
+        
+        public double TotalCostsBasket()
+        {
+            double totalCosts = 0;
+            foreach (var item in items)
+            {
+                totalCosts += item.Value;
+            }
+            return totalCosts;
+        }
+    }
+}
diff --git a/tdd-domain-modelling.CSharp.Test/BasketTests.cs b/tdd-domain-modelling.CSharp.Test/BasketTests.cs
new file mode 100644
index 0000000..77445a6
--- /dev/null
+++ b/tdd-domain-modelling.CSharp.Test/BasketTests.cs
@@ -0,0 +1,40 @@
+using NUnit.Framework;
+using tdd_domain_modelling.CSharp.Main;
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    [TestFixture]
+    public class BasketTests
+    {
+        private Basket _basket;
+        [SetUp] 
+
+        public void Setup()
+        {
+            // creates new basket for each test.
+            _basket = new Basket();
+            _basket.addItemsToBasket("Eggs", 1.5d);
+            _basket.addItemsToBasket("Butter", 1.0d);
+            _basket.addItemsToBasket("Tomatoes", 2.5d);
+        }
+
+        
+        [Test]
+        public void AddItemsToBasket() 
+        {
+            // execute add items to basket
+            bool addedItems = _basket.addItemsToBasket("Milk", 2d);
+
+            // check if added items ("Eggs, 1.5d) is in basket -> is true.
+            Assert.That(addedItems, Is.True);
+        }
+
+        [Test]
+        public void TestTotalCostsBasket()
+        {
+            double totalCosts = _basket.TotalCostsBasket();
+
+            Assert.That(totalCosts, Is.EqualTo(5));
+        }
+    }
+}
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