- •About the Authors
- •Contents at a Glance
- •Contents
- •Introduction
- •Goal of the Book
- •How to Use this Book
- •Introduction to the .NET Framework
- •Common Language Runtime (CLR)
- •Class Library
- •Assembly
- •Versioning
- •Exceptions
- •Threads
- •Delegates
- •Summary
- •Introduction to C#
- •Variables
- •Initializing Variables
- •Variable Modifiers
- •Variable Data Types
- •Types of Variables
- •Variable Scope
- •Types of Data Type Casting
- •Arrays
- •Strings
- •Initializing Strings
- •Working with Strings
- •Statements and Expressions
- •Types of Statements
- •Expressions
- •Summary
- •Classes
- •Declaring Classes
- •Inheritance
- •Constructors
- •Destructors
- •Methods
- •Declaring a Method
- •Calling a Method
- •Passing Parameters to Methods
- •Method Modifiers
- •Overloading a Method
- •Namespaces
- •Declaring Namespaces
- •Aliases
- •Structs
- •Enumerations
- •Interfaces
- •Writing, Compiling, and Executing
- •Writing a C# Program
- •Compiling a C# Program
- •Executing a C# Program
- •Summary
- •Arrays
- •Single-Dimensional Arrays
- •Multidimensional Arrays
- •Methods in Arrays
- •Collections
- •Creating Collections
- •Working with Collections
- •Indexers
- •Boxing and Unboxing
- •Preprocessor Directives
- •Summary
- •Attributes
- •Declaring Attributes
- •Attribute Class
- •Attribute Parameters
- •Default Attributes
- •Properties
- •Declaring Properties
- •Accessors
- •Types of Properties
- •Summary
- •Introduction to Threads
- •Creating Threads
- •Aborting Threads
- •Joining Threads
- •Suspending Threads
- •Making Threads Sleep
- •Thread States
- •Thread Priorities
- •Synchronization
- •Summary
- •Case Study
- •Project Life Cycle
- •Analyzing Requirements
- •High-Level Design
- •Primary and Foreign Keys
- •Referential Integrity
- •Normalization
- •Designing a Database
- •Low-Level Design
- •Construction
- •Integration and Testing
- •User Acceptance Testing
- •Implementation
- •Operations and Maintenance
- •Summary
- •Creating a New Project
- •Console Application
- •Windows Applications
- •Creating a Windows Application for the Customer Maintenance Project
- •Creating an Interface for Form1
- •Creating an Interface for WorkerForm
- •Creating an Interface for CustomerForm
- •Creating an Interface for ReportsForm
- •Creating an Interface for JobDetailsForm
- •Summary
- •Performing Validations
- •Identifying the Validation Mechanism
- •Using the ErrorProvider Control
- •Handling Exceptions
- •Using the try and catch Statements
- •Using the Debug and Trace Classes
- •Using the Debugging Features of Visual Studio .NET
- •Using the Task List
- •Summary
- •Creating Form1
- •Connecting WorkerForm to the Workers Table
- •Connecting CustomerForm to the tblCustomer Table
- •Connecting the JobDetails Form
- •to the tblJobDetails Table
- •Summary
- •Introduction to the Crystal Reports Designer Tool
- •Creating the Reports Form
- •Creating Crystal Reports
- •Creating the Windows Forms Viewer Control
- •Creating the Monthly Worker Report
- •Summary
- •Introduction to Deploying a Windows Application
- •Deployment Projects Available in Visual Studio .NET
- •Deployment Project Editors
- •Summary
- •Case Study
- •Project Life Cycle
- •Analyzing Requirements
- •High-Level Design
- •Low-Level Design
- •Summary
- •Populating the TreeView Control
- •Displaying Employee Codes in the TreeView Control
- •Event Handling
- •Displaying Employee Details in the ListView Control
- •Summary
- •Case Study
- •Project Life Cycle
- •Analyzing Requirements
- •High-Level Design
- •Low-Level Design
- •Summary
- •Adding the Programming Logic to the Application
- •Adding Code to the Form Load() Method
- •Adding Code to the OK Button
- •Adding Code to the Exit Button
- •Summary
- •The Created Event
- •Adding Code to the Created Event
- •Overview of XML
- •The XmlReader Class
- •The XmlWriter Class
- •Displaying Data in an XML Document
- •Displaying an Error Message in the Event Log
- •Displaying Event Entries from Event Viewer
- •Displaying Data from the Summary.xml Document in a Message Box
- •Summary
- •Airline Profile
- •Role of a Business Manager
- •Role of a Network Administrator
- •Role of a Line-of-Business Executive
- •Project Requirements
- •Creation and Deletion of User Accounts
- •Addition of Flight Details
- •Reservations
- •Cancellations
- •Query of Status
- •Confirmation of Tickets
- •Creation of Reports
- •Launch of Frequent Flier Programs
- •Summarizing the Tasks
- •Project Design
- •Database Design
- •Web Forms Design
- •Enabling Security with the Directory Structure
- •Summary
- •Getting Started with ASP.NET
- •Prerequisites for ASP.NET Applications
- •New Features in ASP.NET
- •Types of ASP.NET Applications
- •Exploring ASP.NET Web Applications
- •Introducing Web Forms
- •Web Form Server Controls
- •Configuring ASP.NET Applications
- •Configuring Security for ASP.NET Applications
- •Deploying ASP.NET Applications
- •Creating a Sample ASP.NET Application
- •Creating a New Project
- •Adding Controls to the Project
- •Coding the Application
- •Summary
- •Creating the Database Schema
- •Creating Database Tables
- •Managing Primary Keys and Relationships
- •Viewing the Database Schema
- •Designing Application Forms
- •Standardizing the Interface of the Application
- •Common Forms in the Application
- •Forms for Network Administrators
- •Forms for Business Managers
- •Forms for Line-of-Business Executives
- •Summary
- •The Default.aspx Form
- •The Logoff.aspx Form
- •The ManageUsers.aspx Form
- •The ManageDatabases.aspx Form
- •The ChangePassword.aspx Form
- •Restricting Access to Web Forms
- •The AddFl.aspx Form
- •The RequestID.aspx Form
- •The Reports.aspx Form
- •The FreqFl.aspx Form
- •Coding the Forms for LOB Executives
- •The CreateRes.aspx Form
- •The CancelRes.aspx Form
- •The QueryStat.aspx Form
- •The ConfirmRes.aspx Form
- •Summary
- •Designing the Form
- •The View New Flights Option
- •The View Ticket Status Option
- •The View Flight Status Option
- •The Confirm Reservation Option
- •Testing the Application
- •Summary
- •Locating Errors in Programs
- •Watch Window
- •Locals Window
- •Call Stack Window
- •Autos Window
- •Command Window
- •Testing the Application
- •Summary
- •Managing the Databases
- •Backing Up the SkyShark Airlines Databases
- •Exporting Data from Databases
- •Examining Database Logs
- •Scheduling Database Maintenance Tasks
- •Managing Internet Information Server
- •Configuring IIS Error Pages
- •Managing Web Server Log Files
- •Summary
- •Authentication Mechanisms
- •Securing a Web Site with IIS and ASP.NET
- •Configuring IIS Authentication
- •Configuring Authentication in ASP.NET
- •Securing SQL Server
- •Summary
- •Deployment Scenarios
- •Deployment Editors
- •Creating a Deployment Project
- •Adding the Output of SkySharkDeploy to the Deployment Project
- •Deploying the Project to a Web Server on Another Computer
- •Summary
- •Organization Profile
- •Project Requirements
- •Querying for Information about All Books
- •Querying for Information about Books Based on Criteria
- •Ordering a Book on the Web Site
- •Project Design
- •Database Design
- •Database Schema
- •Web Forms Design
- •Flowcharts for the Web Forms Modules
- •Summary
- •Introduction to ASP.NET Web Services
- •Web Service Architecture
- •Working of a Web Service
- •Technologies Used in Web Services
- •XML in a Web Service
- •WSDL in a Web Service
- •SOAP in a Web Service
- •UDDI in a Web Service
- •Web Services in the .NET Framework
- •The Default Code Generated for a Web Service
- •Testing the SampleWebService Web Service
- •Summary
- •Creating the SearchAll() Web Method
- •Creating the SrchISBN() Web Method
- •Creating the AcceptDetails() Web Method
- •Creating the GenerateOrder() Web Method
- •Testing the Web Service
- •Securing a Web Service
- •Summary
- •Creating the Web Forms for the Bookers Paradise Web Site
- •Adding Code to the Web Forms
- •Summary
- •Case Study
- •Project Life Cycle
- •Analyzing Requirements
- •High-Level Design
- •Low-Level Design
- •Summary
- •Overview of Mobile Applications
- •The Microsoft Mobile Internet Toolkit
- •Overview of WAP
- •The WAP Architecture
- •Overview of WML
- •The Mobile Web Form
- •The Design of the MobileTimeRetriever Application
- •Creating the Interface for the Mobile Web Forms
- •Adding Code to the MobileTimeRetriever Application
- •Summary
- •Creating the Forms Required for the MobileCallStatus Application
- •Creating the frmLogon Form
- •Creating the frmSelectOption Form
- •Creating the frmPending Form
- •Creating the frmUnattended Form
- •Adding Code to the Submit Button in the frmLogon Form
- •Adding Code to the Query Button in the frmSelectOption Form
- •Adding Code to the Mark checked as complete Button in the frmPending Form
- •Adding Code to the Back Button in the frmPending Form
- •Adding Code to the Accept checked call(s) Button in the frmUnattended Form
- •Adding Code to the Back Button in the frmUnattended Form
- •Summary
- •What Is COM?
- •Windows DNA
- •Microsoft Transaction Server (MTS)
- •.NET Interoperability
- •COM Interoperability
- •Messaging
- •Benefits of Message Queues
- •Limitations
- •Key Messaging Terms
- •Summary
- •Pointers
- •Declaring Pointers
- •Types of Code
- •Implementing Pointers
- •Using Pointers with Managed Code
- •Working with Pointers
- •Compiling Unsafe Code
- •Summary
- •Introduction to the Languages of Visual Studio .NET
- •Visual C# .NET
- •Visual Basic .NET
- •Visual C++ .NET
- •Overview of Visual Basic .NET
- •Abstraction
- •Encapsulation
- •Inheritance
- •Polymorphism
- •Components of Visual Basic .NET
- •Variables
- •Constants
- •Operators
- •Arrays
- •Collections
- •Procedures
- •Arguments
- •Functions
- •Adding Code to the Submit Button
- •Adding Code to the Exit Button
- •Summary
- •Introduction to Visual Studio .NET IDE
- •Menu Bar
- •Toolbars
- •Visual Studio .NET IDE Windows
- •Toolbox
- •The Task List Window
- •Managing Windows
- •Customizing Visual Studio .NET IDE
- •The Options Dialog Box
- •The Customize Dialog Box
- •Summary
- •Index
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After creating the Web service, you need to add Web methods to the Web service. The code behind the Web service is written in the Service1.asmx.cs file. To access the Service1.asmx.cs file, press the F7 key or double-click the Service1.asmx file.
As you can see in the Service1.asmx.cs file, Visual Studio .NET generates a default code for your Web service. The following section discusses the default code created by Visual Studio .NET.
The Default Code Generated for a Web Service
Creating a Web service includes writing the code for Web methods in a Web service. However, before you add Web methods to the Web service, Visual Studio
.NET generates a default code as shown:
using System;
using System.Collections; using System.ComponentModel; using System.Data;
using System.Diagnostics; using System.Web;
using System.Web.Services;
namespace SampleWebService
{
public class Service1 : System.Web.Services.WebService
{
public Service1()
{
InitializeComponent();
}
//WEB SERVICE EXAMPLE
//The HelloWorld() example service returns the string Hello World
//To build, uncomment the following lines then save and build the project
//To test this web service, press F5
//[WebMethod]
//public string HelloWorld()
634 Project 5 CREATING A WEB PORTAL FOR A BOOKSTORE
//{
//return “Hello World”;
//}
}
}
The preceding code includes the required namespaces in your Web service. In addition, the code creates a namespace with the name of your Web service. Inside the SampleWebService namespace, a public class with the name Service1 is declared.This class contains a default constructor, Service1. In addition, the code contains a simple Web method with the name HelloWorld(). The HelloWorld() Web method returns a string Hello World when the Web service is run.
TIP
As you can see in the preceding code, the Web method HelloWorld() is marked as comment entries.You can remove the front slash (//) signs preceding the Web method declaration statements.
When you remove the comment signs and build the Web service, the Service1.asmx page, as shown in Figure 28-6, is created.
FIGURE 28-6 The Service1.asmx page
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As you can see in Figure 28-6, the Service1.asmx page contains the SOAP message used to send a request for a Web service. In addition, the Service1.asmx page contains the response of the request for the Web service. The response for the SampleWebService Web service is in the form of a SOAP message
The Service1.asmx page contains an Invoke button that you can click to test the Web service. When you click on the Invoke button, the Hello World Web service is displayed, as shown in Figure 28-7.
FIGURE 28-7 The Hello World Web service
Having seen a sample Web service, you can now continue with the procedure for creating the SampleWebService Web service.
Creating a Web Method in the
SampleWebService Web Service
Until now, I have not specified the task that the Web method in the SampleWebService Web service would perform. You can create a Web method that returns the day of the week on which a date falls. For example, if January 1, 2002 was Tuesday, the value returned by the Web method will be 2.
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When you create a Web service, it is a good practice to specify a summary of the Web service. This will help any user who tries to locate a similar Web service. To add a summary to your Web service, add the following line in the beginning of your Web service.
[WebService(Namespace=”http://WebServices/SampleWebService”, Description=”This
service retrieves the day of the week on which a date falls.”)]
The preceding statement includes information about the Web service that you create.This information includes the URL that you can use to access the Web service and a short description of the task performed by the Web service.
After providing the information about the Web service, write the code for the Web method required to perform the specified task. In this case, the task performed by the Web method is to return the day of the week on which a specified date falls.Therefore, you need to pass the date as a parameter to the Web method.
Similar to writing a description for the Web service, you can write a short description for the Web method that you declare in the Web service. To write a description for the Web method, add the following code to the Web service.
[WebMethod(Description=”This method returns the day of the week in integer format. It expects a date in mm/dd/yyyy format and returns 8 if the value specified is invalid.”)]
After adding a description of the Web method to the code, write the actual code for the Web method. The code for the Web method is as follows:
[WebMethod(Description=”This method returns the day of the week in integer format. It expects a date in mm/dd/yyyy format and returns 8 if the value specified is invalid.”)]
public int GetDay(DateTime dt)
{
System.DayOfWeek dw; dw=dt.DayOfWeek; switch(dw.ToString())
{
case “Sunday”:
return 0;
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case “Monday”: |
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return 1; |
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case “Tuesday”: |
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return 2; |
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case “Wednesday”: |
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return 3; |
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case “Thursday”: |
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return 4; |
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case “Friday”: |
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return 5; |
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case “Saturday”: |
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return 6; |
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default: |
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}
}
The preceding code declares a Web method with the name GetDay(). The GetDay() method takes a parameter dt of the struct DateTime. The date for which you want to retrieve the day is passed as a parameter dt to the GetDay() method. In addition, the GetDay() method returns an integer type value that stores the day on which the specified date falls.
Inside the declaration of the method, the code creates a variable, dw, of the enum DayOfWeek. This enumeration is present in the System namespace and is used to specify a day of the week. Next, the code initializes the dw variable to the day for the value passed as a parameter to the GetDay() method.
Then, the switch case statements are used to return an integer value for the day stored in the dw variable. To do this, the value stored in the dw variable is checked using the switch case statements. However, to check for the value stored in the dw variable, you first need to convert this value to a string type value. To do this, you can use the ToString() method.
Once you have written the code for the Web method, your Web service is ready to be tested. The following section discusses the procedure for testing a Web service.