Programming Exercise 2: Classes - Fields, Properties and Constructors

Create a User class. This class should at least contain the following fields:

• User ID - this is equivalent to a login name
  
• Password
  
• First Name
• Last Name
• E-mail Address
• Status - valid values are 'Inactive', 'Active', 'Deleted'
  

Define constructors that accept the following parameter lists:

• All parameters: User ID, Password, First Name, Last Name, E-mail Address
  
• User ID, Password and E-mail Address
  
• User ID and Password Only
  

** The status field should be initialized to 'Active' upon creation
** Constructors 2 and 3 should use a constructor initializer

Define read-only properties that return the following:

• IsActive – whether or not the account's status is active
• FullName – a concatenation of the account's first and last names
  

Define additional properties that behave as follows:

• UserID
• Set operation should ensure the user id does not start with a digit and should only update the user id field if the given value is valid
  
• Get operation just returns the user id
• Password
  
• Set operation should validate the password length is within 8 to 20 characters and should only update the password field if the given value is valid
  
• Get operation just returns the password

** You can reuse elements from your first programming exercise.
** Refer to the string class in the MSDN for methods in processing strings

After implementing these, you should be able to use your class as follows:

class Program
{
    static void Main(string[] args)
    {
        User user = new User("jtamad", "jtamad",
            "Juan", "Tamad", "jtamad@tapulan.com");

        Console.WriteLine(user.IsActive);  // Outputs "True"
        Console.WriteLine(user.FullName);  // Outputs "Juan Tamad"

        user.UserID = "1jtamad";           // Outputs an error
        user.Password = "1jta";            // Outputs an error
        Console.WriteLine(user.UserID);    // Outputs "jtamad", no changes
        Console.WriteLine(user.Password);  // Outputs "jtamad", no changes

        user.UserID = "juantamad";
        user.Password = "juantamad";
        Console.WriteLine(user.UserID);    // Outputs "juantamad"
        Console.WriteLine(user.Password);  // Outputs "juantamad"
    }
}