c-sharp-onsite-1.md

Contact Management System

Objective

Create a console application that manages personal and professional contacts with data validation and search capabilities.

Technical Requirements

1. Data Structure

class Contact {
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string PhoneNumber { get; set; }
    public string Email { get; set; }
    public DateTime Birthday { get; set; }
    public ContactType Type { get; set; }  // Personal or Professional
}

enum ContactType {
    Personal,
    Professional
}

2. Required Functionality

a) Contact Creation

• Prompt user for all contact fields
• Implement the following validations:
  • Names: 2-50 characters, letters only
  • Phone: Format (XXX) XXX-XXXX or XXX-XXX-XXXX
  • Email: Must contain @ and valid domain (.com, .org, etc.)
  • Birthday: Cannot be future date, must be > 18 years old
  • Must confirm data before saving

b) Contact Display

• Show all contacts in formatted table
• Include columns: Full Name, Phone, Email, Age, Type
• Sort options:
  • Alphabetical by last name
  • By age (youngest/oldest)
  • By type

c) Search Functionality

• Search by partial name match
• Search by age range
• Search by contact type
• Display "No matches found" when appropriate

d) Data Management

• Store minimum of 5 contacts
• Allow contact deletion
• Allow contact information updates
• Prevent duplicate email addresses

3. User Interface Requirements

• Clear menu system (1-Display, 2-Add, 3-Search, 4-Update, 5-Delete, 6-Exit)
• Input validation messages
• Confirmation messages for actions
• Error messages must be descriptive
• Option to return to main menu from any point

4. Error Handling

Implement try-catch blocks for:

• Invalid data entry
• Search with no results
• Update/delete of non-existent contact
• Invalid menu selection

Sample Interaction

=== Contact Management System ===
1. Display All Contacts
2. Add New Contact
3. Search Contacts
4. Update Contact
5. Delete Contact
6. Exit

Enter your choice (1-6): 2

=== Add New Contact ===
Enter First Name: John
Enter Last Name: Smith
Enter Phone ((XXX) XXX-XXXX): (555) 123-4567
Enter Email: [email protected]
Enter Birthday (MM/DD/YYYY): 01/15/1980
Select Type (1-Personal, 2-Professional): 1

Contact Summary:
Name: John Smith
Phone: (555) 123-4567
Email: [email protected]
Age: 44
Type: Personal

Save contact? (Y/N): Y
Contact saved successfully!

Evaluation Criteria

1. Code Structure (30%)

• Proper class design
• Clear method organization
• Consistent naming conventions
• Appropriate comments
• Code reusability

2. Data Validation (25%)

• All input fields properly validated
• Appropriate error messages
• Proper exception handling
• Edge cases handled

3. Functionality (25%)

• All required features working
• Correct calculations
• Proper data storage
• Efficient search implementation

4. User Experience (20%)

• Clear menu system
• Informative messages
• Logical program flow
• Error recovery