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Answers for Chapter 10

Quiz

  1. Label controls give you the ability to dynamically change the text later.

  2. LinkButton, HyperLink controls

  3. Either use the Image control, the ImageButton control (if the image is intended to be clicked on) or simply use "Insert, Image" from the menu.

Exercises

  1. Because of the conditions on the form, we should use the Validator controls. We will add them to each of the controls, most will be RequiredFieldValidators, but we will also need a CompareValidator to ensure the two passwords match. In addition, we will see how to create a password field.

  2. Create a new project (or add a new form to an existing project). Add a new Table (Table, Insert, TableÖ) to the form, creating a new Table with 3 columns and 6 rows. See Figure 10.9 for details.

Figure 10.9 Insert Table dialog.

Insert Table dialog.

Add three labels to the new form, one in each of the first three rows of the first column. Similarly, add four TextBox controls to the first four rows of the second column. The end result should look similar to Figure 10.10.

Figure 10.10 The Web Form in progress.

The Web Form in progress.

To complete the second column, add a Button and another Label control. Finally, to the third column, add (from top to bottom): three RequiredFieldValidators and a CompareValidator. Set the properties of all controls as shown in Table 10.6.

Table 10.6 Properties for the Registration Form

Control

Property

Value

First Label

NameID(ID)

lblName

 

Text

Name:

 

Font -Bold

True

Second Label

NameID(ID)

lblAlias

 

Text

Alias:

 

Font- Bold

True

 

MaxLength

10

Third Label

NameID(ID)

lblPassword

 

Text

Password:

 

Font- Bold

True

First TextBox

NameID(ID)

txtName

Second TextBox

NameID(ID)

txtAlias

 

MaxLength

10

Third TextBox

NameID(ID)

txtPassword1

 

TextMode

Password

Fourth TextBox

NameID(ID)

txtPassword2

 

TextMode

Password

Button

NameID(ID)

cmdRegister

 

Text

Register

Label

NameID(ID)

lblSummary

 

BackColor

#E0E0E0

 

BorderColor

Silver

 

BorderStyle

Groove

 

BorderWidth

1px

 

Text

<blank>

First Validator

NameID(ID)

reqName

 

ControlToValidate

txtName

 

ErrorMessage

Name is a required field.

Second Validator

NameID(ID)

reqAlias

 

ControlToValidate

txtAlias

 

ErrorMessage

Alias is a required field.

Third Validator

NameID(ID)

reqPassword

 

ControlToValidate

txtPassword1

 

ErrorMessage

You must enter a password.

CompareValidator

NameID(ID)

cmpPassword

 

ControlToValidate

txtPassword2

 

ControlToCompare

txtPassword1

 

ControlToValidate

txtPassword2

 

ErrorMessage

Two passwords must match.


Finally, we are ready to add the code. As before, we don't have to add any code for the validation, as the control manage this. As such, we have little code to add to the page. The only code we need to add is when the user clicks on the register button. This will only run if all the errors are cleared. It simply displays a message in the summary label. Double-click on the Register button and add the code in Listing 10.5.

Listing 10.5 Code for the Register button

1   Public Sub cmdRegister_Click(ByVal sender As Object, ByVal e As System.EventArgs)
2     lblSummary.Text = "Welcome, " & txtAlias.Text
3   End Sub

Build and run the project. Once the browser is available, try entering in different values for the fields. Clear any entry you have made for the Name and Alias fields. You should see the error messages for these controls. Enter two different passwords to see the CompareValidator in action (See Figure 10.11). Finally, enter in values for the Name, Alias and matching Passwords to see the final summary. See Figure 10.12.

Figure 10.11 Registration form with errors.

Figure 10.12 Registration form completed.

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