qr code c# mvc 3: Case Scenario Answers in C#

Print QR Code in C# 3: Case Scenario Answers

3: Case Scenario Answers
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Case Scenario 1: Validating Input
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1. You can use separate ASP.NET RegularExpressionValidator controls to restrict the input for each of the three boxes. For the company name validator, set the ValidationExpression property to [a-zA-Z'`- \s]{1,40} . For the contact name validator, you can use the regular expression, [a-zA-Z'`- \s]{1,30} . Finally, for the phone number validator, you can use ASP.NET s built-in regular expression, ((\(\d{3}\) )|(\d{3}-)) \d{3}-\d{4} . You can write code to further constrain, reject, and sanitize the input. In particular, if the database developer provides further restrictions such as not allowing
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Answers
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apostrophes or percent symbols, you can remove those symbols from the input by using the String.Replace method.
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Case Scenario 2: Processing Data from a Legacy Computer
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1. Yes, you can extract data from text reports using regular expressions. You could use the Regex.Match method and the Match.Groups collection to extract the important data. 2. Yes, you can read ASCII files. You do not need to specify a certain type of encoding to read ASCII files because the standard settings for file streams will process ASCII correctly.
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4: Lesson Review Answers
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Lesson 1
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1. Correct Answers: B and C A. Incorrect: Remove will return without exception, regardless of whether the item exists in the collection. B. Correct: Contains can be used to test to whether the item exists in the collection. C. Correct: IndexOf will return <;$MI>1 if the item does not exist in the collection. D. Incorrect: Returning the count of the collection will not reveal whether an item is in the collection. 2. Correct Answers: A, C, and D A. Correct: Comparer will compare two objects and return an integer that represents whether the left-hand object is less than, equal to, or greater than the right-hand object. B. Incorrect: The class compares two objects relatively, not for identity of references. C. Correct: It is used in the ArrayList.Sort method to do the default sorting. D. Correct: It is the default implementation of the IComparer implementation.
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Answers
Lesson 2
1. Correct Answers: A and C A. Correct: It does retrieve the item from the front of the collection. B. Incorrect: It does not add an item to the collection. C. Correct: As it retrieves an item, it also removes it from the collection. D. Incorrect: It does not clear the collection. 2. Correct Answer: C A. Incorrect: The stack is a last-in, first-out collection. B. Incorrect: The stack is a last-in, first-out collection. C. Correct: It is a last-in, first-out collection. D. Incorrect: The stack is a last-in, first-out collection.
Lesson 3
1. Correct Answers: B and D A. Incorrect: GetType is not called to determine uniqueness. B. Correct: The hash value from the object is used to see whether the hash has been used in the collection. C. Incorrect: The string representation of the object does not determine whether the key is unique. The Hashtable class only uses the hash value to determine uniqueness. D. Correct: If two hash values are identical, Equals can be called to determine whether two objects are in fact equal before assigning the value to a key. 2. Correct Answer: A A. Correct: You pass an object that supports the interface to override the way that uniqueness is compared. B. Incorrect: You cannot assign an IEqualityComparer once the Hashtable has been created. C. Incorrect: You can use IEqualityComparer with a Hashtable. D. Incorrect: The Hashtable supports a constructor that accepts an IEqualityComparer, but it does not implement the interface itself.
Answers
Lesson 4
1. Correct Answers: C and D A. Incorrect: Only case-insensitive Hashtable and SortedList objects can be made from the CollectionUtil class. B. Incorrect: Only case-insensitive Hashtable objects can be made from the CollectionUtil class, not culture-invariant ones. C. Correct: Case-insensitive Hashtable objects can be created with the CollectionUtil class. D. Correct: Case-insensitive SortedList objects can be created with the CollectionUtil class. 2. Correct Answer: A A. Correct: Only strings can be stored as a Value in StringDictionary. B. Incorrect: Only strings can be stored as a Value in StringDictionary. C. Incorrect: Only strings can be stored as a Value in StringDictionary. D. Incorrect: Only strings can be stored as a Value in StringDictionary.
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