本文介绍了示例应用程序各页面功能及相关技术。涵盖主页面、登录页、产品页等，涉及创建超链接、表单认证、处理控件事件、使用数据集对象等知识，还包括调试、错误处理、框架类使用、状态管理及Visual Basic.NET语言基础等内容。
In this section, we'll introduce the major portions of the sample
application you'll be building and investigating as you work through this
book. To get the most out of this book, we assume you are able to perform
the following tasks:
Create programs in some programming language (preferably Visual Basic or
VBScript)
Create a virtual directory in IIS
Create basic HTML Web pages
Write basic SQL statements
At this point, it's worth taking a few minutes to see what types of pages
you'll be creating and how they display data from the Northwind sample
database. We've described the functionality of each page and what you can
expect to learn from each example.
The Main Page
The main page, shown in Figure 1.1, provides a jumping-off place for the
rest of the application. On this page, you'll learn:
How to create hyperlinks using HyperLink controls
How to use LinkButton controls
How to dynamically choose which hyperlinks to display
How to navigate to other pages
Figure 1.1. Use main.aspx to navigate to all your other pages.
The Login Page
You'll use the login page, shown in Figure 1.2, to allow users to log in to
your application. In the beginning of this book, you will use this page to
restrict access to certain menu items. Later, you'll learn to use this page
as a required login page, disallowing access to the site until the user has
successfully authenticated. (In the sample application, one of the valid
login ID/password pairs is King/465.)
Figure 1.2. The Login page helps you to secure your site against unwanted
intruders.
On this page, you'll learn:
How to respond to Click events on Button controls
How to set Session variables
How to use Forms-based authentication
How to redirect to a starting page if a user enters valid authentication
information
How to authenticate users against data in a database
The Products Page
The Products.aspx page, shown in Figure 1.3, uses a number of different
controls and displays data from Microsoft SQL Server. You'll fill
DropDownList controls, a DataGrid control, and Label controls with data
from several tables in the Northwind database.
Figure 1.3. The Products.aspx page shows how to respond to many different
events on different controls.
On this page, you'll learn:
How to react to handle control events
How to use the ADO.NET DataSet object
How to configure a DataAdapter so that it can retrieve data
How to fill a DropDownList control using a DataReader
How to use Connection and Command objects
How to execute action queries
The Employees and Orders Page
The Employees.aspx page, shown in Figure 1.4, displays a drop-down list
containing employee names. When you select an employee, the page displays
orders for the selected employee in a DataGrid control.
Figure 1.4. The Employees.aspx page shows that setting relationships
between tables is easy with the DataSet object.
On this page, you'll learn:
How to build a DataSet containing multiple DataTable objects
How to add a relationship between DataTable objects
How to retrieve orders based on a selected employee, using parent/child
relationships
How to store and retrieve a DataSet using a Session variable
The Employees (Stored Procedures) Page
The EmployeeSP.aspx page, shown in Figure 1.5, will show you how to work
with SQL Server stored procedures. This page demonstrates calling several
stored procedures that you'll add to the Northwind sample database.
Figure 1.5. The EmployeeSP.aspx page shows you how to call stored
procedures using both OleDb and SqlClient namespaces.
On this page, you'll learn:
How to call stored procedures
How to pass parameters to stored procedures
How to retrieve output parameters returned from a stored procedure
How to use both the OleDb and SqlClient namespaces, and why you would use
one or the other
Differences between the OleDb and SqlClient namespaces, with regards to
stored procedures
The Sales by Category Page
The CategorySales.aspx page, shown in Figure 1.6, shows you techniques for
formatting, sorting, and selecting items within the DataGrid control. The
DataGrid control is incredibly powerful, and this page demonstrates many of
the useful features of this control.
Figure 1.6. The DataGrid control can be formatted in many different ways,
and you'll use several useful techniques on this page.
On this page, you'll learn:
How to format columns in a DataGrid control
How to sort a DataGrid's data by clicking the column header
How to select an item and respond to the ItemCommand event procedure
How to pass information to the ItemCommand event procedure
How to enable paging on a DataGrid control
The Edit Products Page
The DataGrid control not only allows you to display data, it allows you to
edit data in place, as well. The ProductsEdit.aspx page, shown in Figure
1.7, will allow you to edit product information within the grid as well as
edit detail information on a separate page.
Figure 1.7. The tasks of adding, editing, and deleting on a DataGrid
control are relatively easy, but they do require some care. This page shows
you how.
On this page, you'll learn:
How to edit data "in place" in the DataGrid control
How to delete a row from a DataGrid and the underlying database table
How to add a row to a DataGrid control and the underlying database table
How to add a hyperlink to a column of data so that selecting an item from
the column navigates to a detail editing page
How to use template columns in a DataGrid control
The Product Details Page
When you select a link on the ProductsEdit.aspx page, shown in Figure 1.7,
you navigate to the ProductDetail.aspx page, shown in Figure 1.8. This page
shows you how to add or edit data on a "detail page" and save that data
back to the underlying database table.
Figure 1.8. A detail page is somewhat easier to enter data into than
editing directly on the DataGrid control. This page shows how you can link
a detail page and a DataGrid control.
On this page, you'll learn:
How to add or edit data retrieved from a DataGrid control
How to submit data back to the database
How to position a DropDownList control to a specified value
The Categories Page
The Categories.aspx page, shown in Figure 1.9, demonstrates how to display
bound lists, drawing items from a data source.
Figure 1.9. Using the Repeater allows you to customize the display of the
data using any HTML templates. In this case, the item template displays a
bulleted list.
On this page, you'll learn:
How to use the Repeater control
How to create header, footer, and item templates
How to load data into the Repeater control
How to display links using the Repeater control
The Category Detail Page
The CategoryDetail.aspx page, shown in Figure 1.10, shows another use of
the Repeater control. In this case, the item template is more complex and
displays data in a nontabular format.
Figure 1.10. You can create complex formatting using the Repeater control
because you decide how to lay out the various data elements.
On this page, you'll learn:
How to use the Repeater control to display a nontabular data layout
How to select an item in the Repeater and display data based on the item
selected
The Employee Information Page
The EmployeeInfo.aspx page, shown in Figure 1.11, shows you how to display
images and detail information and how to edit the data. This page also
demonstrates how to display data in multiple rows and columns (as you might
when displaying data for a phone list or items available for sale).
Figure 1.11. The DataList control is the most flexible control available if
you want to display multiple rows and columns of data.
On this page, you'll learn:
How to use the DataList control
How to display rows of data using the DataList control and its HTML
templates
How to use the HTML designers for DataList templates
How to add, edit, and delete data using the DataList control
The Employee Maintenance Page
The EmpMaint.aspx page, shown in Figure 1.12, shows how you can validate
data on an ASP.NET page. This page demonstrates several different
techniques for validating data, including requiring input, ensuring data is
within a certain range, and running your own code in order to validate data.
Figure 1.12. Validating data is simple using the ASP.NET validation
controls.
On this page, you'll learn:
How to use all the validation controls, including the
RequiredFieldValidator, RegularExpressionValidator, and RangeValidator
controls
How to display a validation summary using the ValidationSummary control
How to create your own validation procedures for use with the
CustomValidator control
The Change Password Page
The PwdChange.aspx page, shown in Figure 1.13, shows how you can compare
two values and disallow posting the page until the values are the same.
This is a common technique used when asking for a new user password. On
this page, you'll learn how to use the CompareValidator control.
Figure 1.13. Use the CompareValidator control to verify that two values
match.
Using the Debugger
The Jumpstart/Debugger/Debugger.sln solution, shown in Figure 1.14, walks
you through using many of the features of the debugger provided by Visual
Studio .NET.
Figure 1.14. Learn to use the Visual Studio .NET debugger with this project.
In this solution, you'll learn:
How to set breakpoints
How to use the Debug class
How to use WriteLine and Assert
How to use conditional compilation
Handling Errors
The Jumpstart/ErrorHandling/ErrorHandling.sln solution, shown in Figure
1.15, walks you through structured exception handling, which is new in
Visual Basic .NET.
Figure 1.15. Demonstrate various types of exception handling using this
sample project.
In this solution, you'll learn:
How to add exception handling to your code
How to use the Try and Catch keywords
How to retrieve exception information
How to add code that runs whether or not an exception occurs using the
Finally keyword
Using the Framework Classes
The Jumpstart/Framework/FrameworkClasses.sln solution, shown in Figure
1.16, introduces and demonstrates several objects and namespaces (selected
from the thousands of available objects and namespaces) provided by the
.NET Framework.
Figure 1.16. This page navigates to sample pages, testing out several of
the .NET Framework classes.
In this solution, you'll learn:
How to use the OleDb and SqlClient namespaces
How to write to a file using the System.IO namespace
How to use the StringBuilder class
How to use the Collection classes
How to use XML classes
Using Other ASP.NET Controls
The Jumpstart/MiscWebControls/MiscWebControls.sln solution, shown in Figure
1.17, walks you through using many of the ASP.NET controls not covered
elsewhere in this book. The .NET Framework provides a rich palette of
server controls, and some of them just didn't fit into the Northwind
project you'll create.
Figure 1.17. Learn how to use the RadioButtonList, CheckBoxList, AdRotator,
Calendar, Literal, and Placeholder controls in this solution.
In this solution, you'll learn:
How to use the CheckBoxList and RadioButtonList controls to select from a
list of values
How to use the Calendar control to select dates
How to use the AdRotator control to display randomly selected images from
an XML file containing a list of available images
How to use the Literal control to inject HTML into a page
How to use the Placeholder control to reserve space for dynamically created
controls
Using the Mobile Internet Toolkit
The Jumpstart/MITSample/MITSample.sln solution, shown in Figure 1.18, walks
you through creating a simple page using the Mobile Internet Toolkit,
showing you how to create Web applications that can be browsed from
multiple handheld devices.
Figure 1.18. The Mobile Internet Toolkit allows you to use Visual Studio
.NET to create mobile applications.
In this solution, you'll learn:
How to build a Web application targeted to mobile devices
How to use the server controls provided by the Microsoft Mobile Internet
Toolkit
How to display data on mobile Web forms
Using State Management
The Jumpstart/StateMgmt/StateMgmt.sln solution, shown in Figure 1.19,
demonstrates using the built-in features of state management in the .NET
Framework.
Figure 1.19. The .NET Framework provides multiple ways in which you can
manage state within your applications. This solution walks you through
several of these techniques.
In this solution, you'll learn:
How to manage state using cookies
How to manage state using StateBag objects
How to manage state using the ASP.NET State service
How to manage state using SQL Server
Introducing Visual Basic .NET Language Basics
The Jumpstart/VBLanguage/VBLanguage.sln solution, shown in Figure 1.20,
introduces you to many of the new features of the Visual Basic .NET
language.
Figure 1.20. Learn features of Visual Basic .NET using this project.
In this solution, you'll learn:
How to respond to events
Which data types are available in VB .NET
How to convert data from one type to another
How to create procedures
How to create classes
How to use Shared methods in classes
application you'll be building and investigating as you work through this
book. To get the most out of this book, we assume you are able to perform
the following tasks:
Create programs in some programming language (preferably Visual Basic or
VBScript)
Create a virtual directory in IIS
Create basic HTML Web pages
Write basic SQL statements
At this point, it's worth taking a few minutes to see what types of pages
you'll be creating and how they display data from the Northwind sample
database. We've described the functionality of each page and what you can
expect to learn from each example.
The Main Page
The main page, shown in Figure 1.1, provides a jumping-off place for the
rest of the application. On this page, you'll learn:
How to create hyperlinks using HyperLink controls
How to use LinkButton controls
How to dynamically choose which hyperlinks to display
How to navigate to other pages
Figure 1.1. Use main.aspx to navigate to all your other pages.
The Login Page
You'll use the login page, shown in Figure 1.2, to allow users to log in to
your application. In the beginning of this book, you will use this page to
restrict access to certain menu items. Later, you'll learn to use this page
as a required login page, disallowing access to the site until the user has
successfully authenticated. (In the sample application, one of the valid
login ID/password pairs is King/465.)
Figure 1.2. The Login page helps you to secure your site against unwanted
intruders.
On this page, you'll learn:
How to respond to Click events on Button controls
How to set Session variables
How to use Forms-based authentication
How to redirect to a starting page if a user enters valid authentication
information
How to authenticate users against data in a database
The Products Page
The Products.aspx page, shown in Figure 1.3, uses a number of different
controls and displays data from Microsoft SQL Server. You'll fill
DropDownList controls, a DataGrid control, and Label controls with data
from several tables in the Northwind database.
Figure 1.3. The Products.aspx page shows how to respond to many different
events on different controls.
On this page, you'll learn:
How to react to handle control events
How to use the ADO.NET DataSet object
How to configure a DataAdapter so that it can retrieve data
How to fill a DropDownList control using a DataReader
How to use Connection and Command objects
How to execute action queries
The Employees and Orders Page
The Employees.aspx page, shown in Figure 1.4, displays a drop-down list
containing employee names. When you select an employee, the page displays
orders for the selected employee in a DataGrid control.
Figure 1.4. The Employees.aspx page shows that setting relationships
between tables is easy with the DataSet object.
On this page, you'll learn:
How to build a DataSet containing multiple DataTable objects
How to add a relationship between DataTable objects
How to retrieve orders based on a selected employee, using parent/child
relationships
How to store and retrieve a DataSet using a Session variable
The Employees (Stored Procedures) Page
The EmployeeSP.aspx page, shown in Figure 1.5, will show you how to work
with SQL Server stored procedures. This page demonstrates calling several
stored procedures that you'll add to the Northwind sample database.
Figure 1.5. The EmployeeSP.aspx page shows you how to call stored
procedures using both OleDb and SqlClient namespaces.
On this page, you'll learn:
How to call stored procedures
How to pass parameters to stored procedures
How to retrieve output parameters returned from a stored procedure
How to use both the OleDb and SqlClient namespaces, and why you would use
one or the other
Differences between the OleDb and SqlClient namespaces, with regards to
stored procedures
The Sales by Category Page
The CategorySales.aspx page, shown in Figure 1.6, shows you techniques for
formatting, sorting, and selecting items within the DataGrid control. The
DataGrid control is incredibly powerful, and this page demonstrates many of
the useful features of this control.
Figure 1.6. The DataGrid control can be formatted in many different ways,
and you'll use several useful techniques on this page.
On this page, you'll learn:
How to format columns in a DataGrid control
How to sort a DataGrid's data by clicking the column header
How to select an item and respond to the ItemCommand event procedure
How to pass information to the ItemCommand event procedure
How to enable paging on a DataGrid control
The Edit Products Page
The DataGrid control not only allows you to display data, it allows you to
edit data in place, as well. The ProductsEdit.aspx page, shown in Figure
1.7, will allow you to edit product information within the grid as well as
edit detail information on a separate page.
Figure 1.7. The tasks of adding, editing, and deleting on a DataGrid
control are relatively easy, but they do require some care. This page shows
you how.
On this page, you'll learn:
How to edit data "in place" in the DataGrid control
How to delete a row from a DataGrid and the underlying database table
How to add a row to a DataGrid control and the underlying database table
How to add a hyperlink to a column of data so that selecting an item from
the column navigates to a detail editing page
How to use template columns in a DataGrid control
The Product Details Page
When you select a link on the ProductsEdit.aspx page, shown in Figure 1.7,
you navigate to the ProductDetail.aspx page, shown in Figure 1.8. This page
shows you how to add or edit data on a "detail page" and save that data
back to the underlying database table.
Figure 1.8. A detail page is somewhat easier to enter data into than
editing directly on the DataGrid control. This page shows how you can link
a detail page and a DataGrid control.
On this page, you'll learn:
How to add or edit data retrieved from a DataGrid control
How to submit data back to the database
How to position a DropDownList control to a specified value
The Categories Page
The Categories.aspx page, shown in Figure 1.9, demonstrates how to display
bound lists, drawing items from a data source.
Figure 1.9. Using the Repeater allows you to customize the display of the
data using any HTML templates. In this case, the item template displays a
bulleted list.
On this page, you'll learn:
How to use the Repeater control
How to create header, footer, and item templates
How to load data into the Repeater control
How to display links using the Repeater control
The Category Detail Page
The CategoryDetail.aspx page, shown in Figure 1.10, shows another use of
the Repeater control. In this case, the item template is more complex and
displays data in a nontabular format.
Figure 1.10. You can create complex formatting using the Repeater control
because you decide how to lay out the various data elements.
On this page, you'll learn:
How to use the Repeater control to display a nontabular data layout
How to select an item in the Repeater and display data based on the item
selected
The Employee Information Page
The EmployeeInfo.aspx page, shown in Figure 1.11, shows you how to display
images and detail information and how to edit the data. This page also
demonstrates how to display data in multiple rows and columns (as you might
when displaying data for a phone list or items available for sale).
Figure 1.11. The DataList control is the most flexible control available if
you want to display multiple rows and columns of data.
On this page, you'll learn:
How to use the DataList control
How to display rows of data using the DataList control and its HTML
templates
How to use the HTML designers for DataList templates
How to add, edit, and delete data using the DataList control
The Employee Maintenance Page
The EmpMaint.aspx page, shown in Figure 1.12, shows how you can validate
data on an ASP.NET page. This page demonstrates several different
techniques for validating data, including requiring input, ensuring data is
within a certain range, and running your own code in order to validate data.
Figure 1.12. Validating data is simple using the ASP.NET validation
controls.
On this page, you'll learn:
How to use all the validation controls, including the
RequiredFieldValidator, RegularExpressionValidator, and RangeValidator
controls
How to display a validation summary using the ValidationSummary control
How to create your own validation procedures for use with the
CustomValidator control
The Change Password Page
The PwdChange.aspx page, shown in Figure 1.13, shows how you can compare
two values and disallow posting the page until the values are the same.
This is a common technique used when asking for a new user password. On
this page, you'll learn how to use the CompareValidator control.
Figure 1.13. Use the CompareValidator control to verify that two values
match.
Using the Debugger
The Jumpstart/Debugger/Debugger.sln solution, shown in Figure 1.14, walks
you through using many of the features of the debugger provided by Visual
Studio .NET.
Figure 1.14. Learn to use the Visual Studio .NET debugger with this project.
In this solution, you'll learn:
How to set breakpoints
How to use the Debug class
How to use WriteLine and Assert
How to use conditional compilation
Handling Errors
The Jumpstart/ErrorHandling/ErrorHandling.sln solution, shown in Figure
1.15, walks you through structured exception handling, which is new in
Visual Basic .NET.
Figure 1.15. Demonstrate various types of exception handling using this
sample project.
In this solution, you'll learn:
How to add exception handling to your code
How to use the Try and Catch keywords
How to retrieve exception information
How to add code that runs whether or not an exception occurs using the
Finally keyword
Using the Framework Classes
The Jumpstart/Framework/FrameworkClasses.sln solution, shown in Figure
1.16, introduces and demonstrates several objects and namespaces (selected
from the thousands of available objects and namespaces) provided by the
.NET Framework.
Figure 1.16. This page navigates to sample pages, testing out several of
the .NET Framework classes.
In this solution, you'll learn:
How to use the OleDb and SqlClient namespaces
How to write to a file using the System.IO namespace
How to use the StringBuilder class
How to use the Collection classes
How to use XML classes
Using Other ASP.NET Controls
The Jumpstart/MiscWebControls/MiscWebControls.sln solution, shown in Figure
1.17, walks you through using many of the ASP.NET controls not covered
elsewhere in this book. The .NET Framework provides a rich palette of
server controls, and some of them just didn't fit into the Northwind
project you'll create.
Figure 1.17. Learn how to use the RadioButtonList, CheckBoxList, AdRotator,
Calendar, Literal, and Placeholder controls in this solution.
In this solution, you'll learn:
How to use the CheckBoxList and RadioButtonList controls to select from a
list of values
How to use the Calendar control to select dates
How to use the AdRotator control to display randomly selected images from
an XML file containing a list of available images
How to use the Literal control to inject HTML into a page
How to use the Placeholder control to reserve space for dynamically created
controls
Using the Mobile Internet Toolkit
The Jumpstart/MITSample/MITSample.sln solution, shown in Figure 1.18, walks
you through creating a simple page using the Mobile Internet Toolkit,
showing you how to create Web applications that can be browsed from
multiple handheld devices.
Figure 1.18. The Mobile Internet Toolkit allows you to use Visual Studio
.NET to create mobile applications.
In this solution, you'll learn:
How to build a Web application targeted to mobile devices
How to use the server controls provided by the Microsoft Mobile Internet
Toolkit
How to display data on mobile Web forms
Using State Management
The Jumpstart/StateMgmt/StateMgmt.sln solution, shown in Figure 1.19,
demonstrates using the built-in features of state management in the .NET
Framework.
Figure 1.19. The .NET Framework provides multiple ways in which you can
manage state within your applications. This solution walks you through
several of these techniques.
In this solution, you'll learn:
How to manage state using cookies
How to manage state using StateBag objects
How to manage state using the ASP.NET State service
How to manage state using SQL Server
Introducing Visual Basic .NET Language Basics
The Jumpstart/VBLanguage/VBLanguage.sln solution, shown in Figure 1.20,
introduces you to many of the new features of the Visual Basic .NET
language.
Figure 1.20. Learn features of Visual Basic .NET using this project.
In this solution, you'll learn:
How to respond to events
Which data types are available in VB .NET
How to convert data from one type to another
How to create procedures
How to create classes
How to use Shared methods in classes
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