Creating Web App - Telemark University College

Step by step Exercises ... • MVC – Model - View –Controller • A new development model where you split your development ... Creating Web App...

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Create a Web App ASP.NET Web forms

Step by step Exercises Hans-Petter Halvorsen, M.Sc.

Web App Exercise • • • •

Visual Studio C# ASP.NET Web Forms ASP: Active Server Pages

Lots of resources for Web Development: http://www.w3schools.com Recommended!!!

Client

ASP.NET

ASP.NET is used to create dynamic web pages

Web Browser

HTML

JavaScript

CSS

Server-side

The server-side ASP.NET pages are converted on the server to HTML pages before it is sent to the client Web Server

ASP.NET C#/VB.NET .NET Framework

ASP.NET – Different ways of creating Web Sites with ASP.NET Web Sites ASP.NET Web Pages

ASP.NET Web Forms

ASP.NET C#/VB.NET .NET Framework http://www.asp.net

ASP.NET MVC

You can use (at least) 3 different approaches when creating Web Sites with ASP.NET

ASP.NET Web Pages

• Singe Page Model (The server-side code is mixed in between the HTML) • Uses the Razor syntax (.cshtml files) • Similiar as Classic ASP and PHP • A tool called Microsoft WebMatrix is optimized for this development model, but you can also use Visual Studio if you want to.

ASP.NET Web Forms

• Similiar to the desktop development model used in WPF • GUI (*.aspx files) and Code (*.aspx.cs) is separated

ASP.NET MVC

• MVC – Model - View – Controller • A new development model where you split your development into 3 parts/components: Models for Data, Views for Display and Controllers for Input

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ASP.NET ASP.NET supports three different development models:

For more experienced Very similar to PHP Web Developers GUI and Code mixed together If you are familiar with PHP this is a good starting point.

The Web version of classic WinForms GUI and Code is separated. If you are familiar with WinForms or WPF, this is a good choice

ASP.NET

http://www.asp.net/get-started/websites

Exercise: Web Form

Hans-Petter Halvorsen, M.Sc.

ASP.NET Web Form Example When you are finished, your Web App should look something like this:

When you enter your Name in the TextBox and click the OK Button, the program should respond with a greetings.

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ASP.NET Web Form Example

http://www.asp.net

Remember to select “Add to Source Control”

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Create New Solution

You have lots of choices here – but we just want to create a very simple Web Form App 11

Create New Web Form

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WinForm1.aspx Page

Used to create the GUI/HMI

“HTML” Code Editor

You can either write text in the Code Editor or in the Designer window WYSIWYG HTML Designer

Hello World Example - GUI

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Hello World Example – The Code WebForm1.aspx.cs

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Running the Application

Enter your Name and click OK button

Note! Remember to Check-in your files into TFS 16

Exercise: Web Form with Database Communication Hans-Petter Halvorsen, M.Sc.

Database Exercise qCreate a Database called LIBRARY and a BOOK table in SQL Server qEnter some Test data into the BOOK table

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Database Exercise qFill a “GridView” with data from the Database Table (BOOK), as shown below

Use the “Wizard” in order to create all the “magic” you need in your application

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When finishing the “Wizard”, your .aspx page should look something like this

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As you see - No Code needed to be written in this example J This is OK for quick demos – but for professional applications, you need to use some hardcore ADO.NET or similiar frameworks. 22

Exercise: Web Form with Database Communication from Scratch Hans-Petter Halvorsen, M.Sc.

Database Exercise 2 q This time: Create everything from scratch using C# code and ADO.NET. q Fill a “DropDownList” with Book Names from the Database q Print the Author Name based on the selected BookName on the screen

Beginning ASP.NET 4.5 in C#, Apress, 2012, Matthew MacDonald (Safari Books Online)

Your .aspx page should look something like this:

The code could be improved by creating a separate Class where you create this Method

This code is executed when the Web Page is loaded

Event Handler

The code could be improved by creating a separate Class where you put this code into a Method

Web.config

All kind og configuration should be stored in the Web.config file, including Database Connection Strings, etc.

Hans-Petter Halvorsen, M.Sc. University College of Southeast Norway www.usn.no E-mail: [email protected] Blog: http://home.hit.no/~hansha/