Papa Bob's Mega Solution Part 2 - Adding an Order to the Database

Tutorial Series: Free C# Fundamentals via ASP.NET Web Apps

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This is the second part to the solution for Papa Bob's Mega Challenge. Going in to this part, you should have your Presentation, Domain and Persistence layers set up and your DTO in place. The database should be created inside the Presentation (Web) project, and the Entity Data Model should be connected to the database from within the Persistence layer.

Step 1: Add the Order to the Database

Before moving on, it would be a good idea to test the structure we've implemented to ensure it works. To do this, we can hard-code an order inside the Persistence layer and attempt to save it to the database. To do this, navigate to the OrderRepository.cs and make the following CreateOrder() method:


This code creates a new instance of the Entity Model that we will save the order to later. The order variable is a new instance of the Persistence layer's Order class that was generated by the Entity Framework:


Next, populate the order's properties with hard-coded values for testing purposes:


Step 2: Create a Spike of Functionality Through the Application

Now that we have a method that will create an order and add it to the database, we need to make a way to add it from the top layer of the application to test the application's structure. This will require a 'spike of functionality' through the application; from the Presentation to Domain, down to the Persistence to call the CreateOrder() method.

Begin in the Domain's OrderManager.cs and create a new method called CreateOrder() that makes a call to the Persistence layer's CreateOrder() method:


This Domain method will be called from the Presentation layer when the user clicks the Order button. In order to for this to happen, we need to add a new Web Form to PapaBobs.Web. Right-click on the Project and add a Default.aspx page. Create an ASP Button control inside the source view of Default.aspx, and give it a new OnClick event:


Inside the Default.aspx.cs' orderButton_Click(), call the Domain layer's CreateOrder() method:


Now, run your project and click the Order button to see what happens:


Note: When running the application, you may have accidentally run one of the Class Libraries instead of the Web project. To make sure this doesn't happen, right-click on 'PapaBobs.Web' and select 'Set as Startup Project'

Step 3: Adding the Entity Framework to the Solution

This error is being thrown because we have yet to modify our connection string in the Presentation layer, nor have we added the Entity Framework package to our solution.

To begin with, we'll need copy and paste some of the connection string found within the App.Config file of the Persistence layer project to the Web.Config file in the Presentation layer:


Copy the text inside this file starting at the opening <configSections> tag and ending with the closing <entityFramework> tag:


Next, open the Web.Config file and, just above the <system.web> tag, paste in the text from App.Config:


Finally, right-click on 'PapaBobs.Web' and select 'Manage NuGet Packages...' From the dialog, browse for the Entity Framework and add it to this project:


Note: At the time this document was published, 6.1.3 was the latest stable version of the Entity Framework. Depending on when you create this project, that might be different. Use whatever is the newest version available to you.

Step 4: Test the Project

Now, save and run the solution. Notice that when you click the Order button, nothing noticeably happens. Stop debugging and return to the Server Explorer. Under the Tables section of PapaBobsDbEntities, right-click on the 'Orders' table and select 'Show Table Data' to see the order information:


Note: You may need to click the Refresh button in the top left-hand side of the page in order for the information to display.


This concludes this part of the solution for Papa Bob's Mega Challenge. Now that we've successfully created a call through all three layers to ensure that our solution is set up properly, we can begin working with the Data Transfer Object in the next part of the solution.

Related Articles in this Tutorial:

Lesson 1 - Series Introduction

Lesson 2 - Installing Visual Studio 2015

Lesson 3 - Building Your First Web App

Lesson 4 - Understanding What You Just Did

Lesson 5 - Working with Projects in Visual Studio

Lesson 6 - Simple Web Page Formatting in Visual Studio

Challenge 1

Solution 1

Lesson 7 - Variables and Data Types

Lesson 8 - Data Type Conversion

Lesson 9 - Arithmetic Operators

Lesson 10 - C# Syntax Basics

Challenge 2 - ChallengeSimpleCalculator

Solution - ChallengeSimpleCalculator

Lesson 11 - Conditional If Statements

Lesson 12 - The Conditional Ternary Operator

Challenge 3 - ChallengeConditionalRadioButton

Solution - Challenge Conditional RadioButton

Lesson 13 - Comparison and Logical Operators

Lesson 13 Challenge - First Papa Bob's Website

Solution - Challenge First Papa Bob's Website

Lesson 14 - Working with Dates and Times

Lesson 15 - Working With Spans of Time

Lesson 16 - Working with the Calendar Server Control

Challenge 4 - Challenge Days Between Dates

Solution - Challenge Days Between Dates

Lesson 17 - Page_Load and Page.IsPostBack

Lesson 18 - Setting a Break Point and Debugging

Lesson 19 - Formatting Strings

Challenge 5 - Challenge Epic Spies Assignment

Solution - Challenge Epic Spies Assignment

Lesson 20 - Maintaining State with ViewState

Lesson 21 - Storing Values in Arrays

Lesson 22 - Understanding Multidimensional Arrays

Lesson 23 - Changing the Length of an Array

Challenge 6 - Challenge Epic Spies Asset Tracker

Solution - Challenge Epic Spies Asset Tracker

Lesson 24 - Understanding Variable Scope

Lesson 25 - Code Blocks and Nested If Statements

Lesson 26 - Looping with the For Iteration Statement

Challenge 7 - Challenge For Xmen Battle Count

Solution - Challenge For Xmen Battle Count

Lesson 27 - Looping with the while() & do...while() Iteration Statements

Lesson 28 - Creating and Calling Simple Helper Methods

Lesson 29 - Creating Methods with Input Parameters

Lesson 30 - Returning Values from Methods

Lesson 31 - Creating Overloaded Methods

Lesson 32 - Creating Optional Parameters

Lesson 33 - Creating Names Parameters

Lesson 34 - Creating Methods with Output Parameters

Challenge 8 - Challenge Postal Calculator Helper Methods

Solution - Challenge Postal Calculator Helper Methods

Mega Challenge Casino

Solution - Mega Challenge Casino

Lesson 35 - Manipulating Strings

Challenge 9 - Phun With Strings

Solution - Challenge Phun With Strings

Lesson 36 - Introduction to Classes and Objects

Challenge - Hero Monster Classes Part 1

Solution - Hero Monster Classes Part 1

Challenge - Hero Monster Classes Part 2

Solution - Challenge Hero Monster Classes Part 2

Lesson 37 - Creating Class Files Creating Cohesive Classes and Code Navigation

Lesson 38 - Understanding Object References and Object Lifetime

Lesson 39 - Understanding the .NET Framework and Compilation

Lesson 40 - Namespaces and Using Directives

Lesson 41 - Creating Class Libraries and Adding References to Assemblies

Lesson 42 - Accessibility Modifiers, Fields and Properties

Lesson 43 - Creating Constructor Methods

Lesson 44 - Naming Conventions for Identifiers

Lesson 45 - Static vs Instance Members

Challenge 10 - Challenge Simple Darts

Solution - Challenge Simple Darts

Lesson 46 - Working with the List Collection

Lesson 47 - Object Initializers

Lesson 48 - Collection Initializers

Lesson 49 - Working with the Dictionary Collection

Lesson 50 - Looping with the foreach Iteration Statement

Lesson 51 - Implicitly-Typed Variables with the var Keyword

Challenge 11 - Challenge Student Courses

Solution - Challenge Student Courses

Mega Challenge War

Solution - Mega Challenge War

Lesson 52 - Creating GUIDs

Lesson 53 - Working with Enumerations

Lesson 54 - Understanding the switch() Statement

Lesson 55 - First Pass at the Separation of Concerns Principle

Lesson 56 - Understanding Exception Handling

Lesson 57 - Understanding Global Exception Handling

Lesson 58 - Understanding Custom Exceptions

Lesson 59 - Creating a Database in Visual Studio

Lesson 60 - Creating an Entity Data Model

Lesson 61 - Displaying the DbSet Result in an ASP.NET GridView

Lesson 62 - Implementing a Button Command in a GridView

Lesson 63 - Using a Tools-Centric Approach to Building a Database Application

Lesson 64 - Using a Maintenance-Driven Approach to Building a Database Application

Lesson 65 - Creating a New Instance of an Entity and Persisting it to the Database

Lesson 66 - Package Management with NuGet

Lesson 67 - NuGet No-Commit Workflow

Lesson 68 - Introduction the Twitter Bootstrap CSS Framework

Lesson 69 - Mapping Enum Types to Entity Properties in the Framework Designer

Lesson 70 - Deploying the App to Microsoft Azure Web Services Web Apps

Papa Bob's Mega Challenge

Papa Bob's Mega Solution Part 1 - Setting up the Solution

Papa Bob's Mega Solution Part 2 - Adding an Order to the Database

Papa Bob's Mega Solution Part 3 - Passing an Order from the Presentation Layer

Papa Bob's Mega Solution Part 4 - Creating the Order Form

Papa Bob's Mega Solution Part 5 - Adding Enums

Papa Bob's Mega Solution Part 6 - Creating an Order with Validation

Papa Bob's Mega Solution Part 7 - Calculating the Order Price

Papa Bob's Mega Solution Part 8 - Displaying the Price to the User

Papa Bob's Mega Solution Part 9 - Creating the Order Management Page


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