Develop a Visual Basic Windows Forms application that will encrypt (character shift) the characters in a string based on a symmetric key (process known as symmetric-key cryptography). The application must also decrypt the message based on the symmetric key used.

The clear-text message (that will be encrypted) is to be stored in a text-file.

The text-file is to be selected using an OpenFileDialog runtime control object

Text-file contents are to be displayed in a Textbox control located on the Windows form (you can also use this textbox to input clear-text characters)

Keys are contained in a ComboBox control object. Users can select a particular key resulting in alternate cipher-text outputKeys are to be a minimum of 4 digits. Each key digit is used for encoding where your program will move to the next digit for every character in the clear-text message.

Since there are a limited number of digits in a key, your program must wrap-back to the first digit

The selected key must be stored in an array

Using the same key for encryption, decrypt the cipher-text message and display it in a textbox on the Windows Form

Since only printable characters are used (see table), if the ANSI code becomes larger than 126, you will need to wrap around to the ANSI code 32 (space)

Use exception handling where needed.

Add comments throughout your code

Example: Using a sample key of 58912, the output would be as follows:

Clear Character	N	J	I	T		V	B	N	e	T
ASCII Code	78	74	73	84	32	86	66	78	101	84
ASCII Code + Key Value	83	82	82	85	34	91	74	87	102	86
Shifted Character	S	R	R	U		[	J	W	f	V

Clear-Text: NJIT VBNet

Cipher-Text: SRRU[JWfV