In C#$,$ Create a simple console$-$based phone book application in C#$.$ This application will allow users to add new contacts and view all saved contacts in a phone book. Contacts will be stored in a text file, and you will use StreamReader and StreamWriter for file operations. This exercise will help you understand basic file I$/$O operations in C# without using arrays or collections.

In your cs file you will write the entire application code. Follow the steps below to implement the required functionalities:

Define Main Structure:

Display a simple menu with options to add a name, view names, or exit the application.

Use a switch statement to handle the user's choice.

Keep the application running in a loop until the user decides to exit using a sentinel of $-1$ to exit

Add Name Functionality:

Prompt the user for a name to add to the phone book.

Use StreamWriter to append this name to phonebook.txt$.$ Save to the same directory as your project. You should be able to use the argument of $./$phonebook$.$txt

When prompting your user you should have one readline for name and one readline for phone number.

When writing names to the text file format your string using a tab $(\backslash$t$)$ so it writes name $[$a tab indentation$]$ phone number

View Names Functionality:

Read and display all names from phonebook.txt using StreamReader.

Submit the following:

Source Code: The source files containing your application code.

Text File: The phonebook.txt file with entries

Evaluation Criteria

Functionality: The application runs without errors, allowing the user to add names to the phone book and view all names stored in the phone book. Test your application thoroughly to catch and fix any bugs.

Code Quality: The code should be well$-$organized, properly formatted, and include comments where necessary for clarity.

File I$/$O: Proper use of StreamReader and StreamWriter for reading from and writing to a text file.

If you want to go the extra mile:

Explore error handling, such as checking if the file exists before trying to read from it$.$

Ensure your application is user$-$friendly, with clear prompts and messages.

Display a header when viewing names and numbers.