First day

Exercise1/StoreData/IAccount.cs

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+namespace StoreData
+{
+    public interface IAccount
+    {
+        /// <summary>
+        /// Check the balance
+        /// </summary>
+        decimal Balance { get; }
+
+        /// <summary>
+        /// Add money to this account
+        /// </summary>
+        /// <param name="amount">The amount to add</param>
+        void Add(decimal amount);
+
+        /// <summary>
+        /// Remove money from this account
+        /// </summary>
+        /// <param name="amount">The amount to remove</param>
+        void Remove(decimal amount);
+    }
+}

Exercise1/StoreData/IShoppingCart.cs

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+using System.Collections.Generic;
+
+namespace StoreData
+{
+    public interface IShoppingCart
+    {
+        /// <summary>
+        /// This method adds a product to the shopping cart
+        /// </summary>
+        /// <param name="p">The product to add</param>
+        void AddProduct(Product p);
+
+        /// <summary>
+        /// Remove product by number
+        /// </summary>
+        /// <param name="index">The index of the product to remove</param>
+        void RemoveProductByNumber(int index);
+
+        /// <summary>
+        /// Clears the entire shopping cart
+        /// </summary>
+        void Clear();
+
+        /// <summary>
+        /// Calculate the sum of the cost of all products
+        /// </summary>
+        /// <returns></returns>
+        decimal TotalSum();
+
+        /// <summary>
+        /// Returns true if cart is empty, otherwise false
+        /// </summary>
+        bool CartIsEmpty();
+
+        List<Product> Products { get; }
+    }
+}

Exercise1/StoreData/Product.cs

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+namespace StoreData
+{
+    public class Product
+    {
+        public decimal Price { get; set; }
+        public string Name { get; set; }
+    }
+}

Exercise1/StoreData/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("StoreData.Properties")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("StoreData.Properties")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("7A332E26-38F4-4649-B445-3BAFDBD15431")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Exercise1/StoreData/StoreData.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{A3587AB8-ED1A-4C9F-9981-42863DB18AF9}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>StoreData</RootNamespace>
+    <AssemblyName>StoreData</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="IAccount.cs" />
+    <Compile Include="IShoppingCart.cs" />
+    <Compile Include="Product.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>