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1. What is the reason for validation 2. What do you do if you want a button to post the page without checking validation 3. What is the best type of validator to use for a radio button list 4. What s the difference between the Static and Dynamic values of the Display property 5. Suppose the first item in your drop-down list is Choose a payment method. How do you make sure users choose one 6. What s the benefit of using the ValidationSummary control 7. What control should you use to make sure the user can t order more of a single item than you actually have in stock 8. Suppose you run a hotel that requires at least two guests stay in a double room, but no more than five guests. What control should you use on the Number of guests field 9. How do you check that the user has entered a valid email address 10. Suppose your theme park offers discounts to customers between the ages of 6 and 12, and also customers over 65. What kind of control would you use to validate the customer is eligible for a discount, while still using a single age field
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Exercise 5-1. In the exercises in this chapter, you re going to create a form that users can fill out if they want to participate in a friendly phone survey (I m told some people like to get survey calls in the middle of dinner). To begin, create a page with a table with three columns: label, control, and validator. Then add text boxes for the user s name, address, city, state, and zip code. Be sure to add the appropriate validators for each field don t worry about the format of the input right now; you just want to make sure that something is filled in. Finally, add a Submit button. It doesn t matter too much what this form looks like, but it could look something like Figure 5-8. Exercise 5-2. Let s make things a little more interesting this time. For starters, remove the text from the individual validators to error messages, and add a summary control at the bottom of the form, above the Submit button. Next, you don t want anyone participating in the survey if they re under 18, so add another label and field asking for the user s age. Add appropriate validators to make sure the user isn t too young. Because you re polite, you ll ask for a date when you should call the user, but your survey is only going on in July 2007. Add another table row with a label and a field asking for a date, and add the appropriate validators to make sure the date is sometime in July 2007. Your form should look something like Figure 5-9.
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5: Validation
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Exercises
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Exercise 5-3. If the user doesn t mind being called at home, you might as well make a follow-up call to ask additional survey questions. This call still has to take place in July, but if it s a follow-up call, it would have to be later than the first call. Add a row to the table with a label and textbox where users can enter a date for the follow-up call, and add appropriate validators to make sure the follow-up call comes after the initial call. The result should look something like Figure 5-10.
Exercise 5-4. If you re going to call the user at home, you ll need a phone number to call. If the user is willing to give out his phone number, you might as well get his email address as well. After all, you never know when you ll need it. But if the user forgets a digit, or leaves off the .com from his email address, it ll do you no good. Add two more rows to the table, with labels and text fields where the user can enter a phone number and email address. Then add the appropriate validators to make sure that the input is in the correct form. The form should look something like Figure 5-11.
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