C# ПІДРУЧНИКИ / c# / Premier Press - C# Professional Projects

3.In the Templates: pane of the Add New Item dialog box, select the Windows Form icon.

4.In the Name text box, type the name of the form as CustomerForm and click on the Open button.

Visual Studio .NET creates a blank form with the name CustomerForm. You can now add controls to the form. To do this, perform the following steps.

1.Add four Label controls to the form.

2.In the Properties window, change the following properties of the controls:

Label1 control:

Name: lblCarNo

Text: Car No.

Label2 control:

Name: lblName

Text: Name

Label3 control:

Name: lblAddress

Text: Address

Label4 control:

Name: lblMake

Text: Make

3.Add five text boxes to the form.

You will change the properties of the text boxes after creating DataSet for the form.

4.Add six button controls to the form and change the following properties of the controls:

Button1 control:

Name: btnSave

Text: Save

Button2 control:

Name: btnEdit

Text: Edit

170 Project 1 CREATING A CUSTOMER MAINTENANCE PROJECT

Button3 control:

Name: btnCancel

Text: Cancel

Button4 control:

Name: btnExit

Text: Exit

Button5 control:

Name: btnPrevious

Text: Previous

Button6 control:

Name: btnNext

Text: Next

5.On the File menu, click on the Save option to save the form.

Figure 8-18 shows the layout of CustomerForm.

FIGURE 8-18 CustomerForm with the controls

Creating an Interface for ReportsForm

ReportsForm includes a GroupBox control that contains four radio buttons. You can select any radio button to generate a corresponding report. To create ReportsForm, add a new form to the project and name the form ReportsForm. You can now add controls to the form.

1.Add a Label control, a GroupBox, four radio buttons, and a button control to the form.

2.Change the following properties of the control in the Properties window. Label control:

Name: label1

Text: Select the radio button to generate the report.

Font:

Name: Microsoft Sans Serif

Size: 10

Bold: True

GroupBox control:

Name: groupBox1

Text: Reports:

RadioButton1 control:

Name: radioButton1

Text: Monthly Consumable Report

RadioButton2 control:

Name: radioButton2

Text: Monthly Consumer Visit Report

RadioButton3 control:

Name: radioButton3

Text: Monthly Balancing and Alignment Report

RadioButton4 control:

Name: radioButton4

Text: Monthly Worker Report

Button control:

Name: btnExit

Text: Exit

3.On the File menu, click on the Save option to save the form.

Figure 8-19 shows the interface of the ReportsForm.

172 Project 1 CREATING A CUSTOMER MAINTENANCE PROJECT

FIGURE 8-19 ReportsForm with the controls

Creating an Interface for JobDetailsForm

JobDetailsForm is used to view and modify the records in the JobDetails table. You can create JobDetailsForm by using Data Form Wizard. Data Form Wizard is used to create forms that interact with an underlying database. You will look at creating JobDetailsForm in the subsequent chapter, which deals with database interactivity in a Windows form.

Summary

In this chapter, you learned that Visual Studio .NET projects are the containers used to hold the development material for an application. A Visual Studio .NET project contains files, folders, and references to the databases that you may require while developing your project. To develop any application in Visual Studio .NET, you need to create a new project by using the New Project dialog box. You can select the template from the available templates to create a variety of applications, such as Windows applications, ASP.NET Web applications, ASP.NET Web services, console applications, and so on.

Using Visual Studio .NET templates, you can create applications that display the output in a console window. Such applications are called console applications. A console application does not have a user interface and is run from the command prompt. Another type of application that you can create using Visual Studio

.NET templates is a Windows application. Visual Studio .NET provides a graph-

ical interface and the classes in the .NET class library for creating Windows applications. Next, you learned to create a sample Windows application and to add controls to the forms in the application. When you create a Windows application by using the templates provided by Visual Studio .NET, a default form, Form1, is created for you in the design view. Form1 is an instance of the Form class of the .NET class library and is an interface for your application.

The chapter introduced you to several controls provided in the Windows Forms toolbox.These controls include a Label control, a TextBox control, a Button control, a MainMenu control, a RadioButton control, and so on.

Finally, you used the general concepts explained in the chapter to create the layouts of the forms used in the Customer Maintenance project.These forms include Form1, WorkerForm, CustomerForm, ReportsForm and JobDetailsForm.

This page intentionally left blank

176 Project 1 CREATING A CUSTOMER MAINTENANCE PROJECT

Validation and exception handling form an integral part of any business application. Your application needs to be robust to withstand any anomalies of

application execution.

Anomalies in an application can occur because of unexpected conditions. For example, you may design your application to open a file in the write mode. Although the code will not generate any error if the file is closed, if a user opens the file in another application and then executes your application, your application can generate an unrecoverable error. To avoid such run-time errors, you should implement an exception-handling mechanism in your application.

Exception handling provides many uses in an application. For example, if a user specifies the date in an incorrect format, the user can be allowed to rectify the error and proceed with the registration. Similarly, if the databases pertaining to the application are not responding, the application can display a message to that effect and allow the user to select an alternate location for the database.

This chapter provides an in-depth coverage of the exception-handling capabilities of Visual C#. You will apply exception-handling logic to the Customer Maintenance project. In addition, Visual Studio .NET provides a number of debugging tools that you can use to debug your application.This chapter will also introduce you to the debugging tools and help you use the important ones to debug your application.

Performing Validations

You should always validate data in a Windows form before updating the data in a database. This method has several benefits, some of which include:

Improved response time. The response time of an application is shorter because the application does not need to attempt to update the data in the database and then retrieve an error message because of incorrect data.

Accuracy of data. The application is less prone to sending incorrect data to the database.