Help me solve this in C#. Begin with this code bellow here: using System;using System.Collections.Generic;class Encryption {List<char> symbols = new List<char>();List<char> alphabets = new List<char>();public Encryption() {Copy and past the whole code from first page.} CSE1322L Assignment 2 v5.1.pdfSearchPage 2 of 62) Add a method return_alphabet_index, which takes in an alphabetic character(char) and returns the index (int) of the character in the alphabets list, i.e. a wouldreturn 0, b would return 1.3) Add a method return_symbol, which takes in an int (integer) and returns thesymbol stored at that position, i.e. 5 would return &4) Add a method return_symbol_index, which takes in a symbol (char) and returnsthe index (int) of the symbol in the symbols list, i.e. ! would return 0, @ would{{symbols.Add('!');symbols.add('!');symbols.Add('@');symbols.add('@');symbols.Add('#);symbols.Add('$');symbols.add(#');symbols.add('$');symbols.add(^);symbols.Add(^);symbols.Add('&');symbols.add('&');symbols.Add('*');symbols.Add('(');symbols.Add(')');symbols.Add('_');symbols.Add('-');symbols.Add('+');symbols.Add('=");symbols.Add('?');symbols.Add(',');symbols.Add('{');symbols.Add('}');symbols.Add('[');symbols.Add(']');symbols.Add('/');symbols.Add('');symbols.Add(';');symbols.Add(':');symbols.Add('.');symbols.Add('<');symbols.add(*');symbols.add('(');symbols.add(')');return 1.5) Add a method encrypt_message, which takes in a plain-text string and returnsthe encrypted version of that string, i.e. Dwags would return $:!*]The method should convert the plain-text string to lowercase (hint: Java:.toLowerCase(), C#: ToLower())The method should process each character in the plain-text string individually,encrypting each character and building a new string of encrypted characters(hint: Java: toCharArray(), C#: ToCharArray(), return_alphabet_index(),return_symbol()If an invalid alphabet character is found, the following string should besymbols.add('_');symbols.add('-');symbols.add('+');symbols.add('=');symbols.add(?');symbols.add(',');symbols.add(' {');symbols.add('}');symbols.add('[');symbols.add(']');symbols.add('/");symbols.add('|');symbols.add(';');symbols.add(':');symbols.add('.');symbols.add('<');symbols.add(>');returned: "Error: Invalid Character"6) Add a method decrypt_message, which takes in an encrypted string and returnsthe decrypted version of that string, i.e. $:!*] would return dwagsThe method should process each symbol in the encrypted string individually,decrypting each symbol and building a new string of decrypted characters(hint: Java: toCharArray(), C#: ToCharArray(), return_symbol_index(),return_alphabet())If an invalid symbol is found, the following string should be returned: "Error:Invalid Symbol"symbols.Add(>');for(char letter='a';letter<='z';lettertt)for(char letter='a';letter<='z';lettertt){{alphabets.Add(letter);alphabets.add(letter);}}Driver Program:}}Create an object of the class Encryption.Prompt the user with the following menu:This creates two lists (2 ArrayLists in Java, and 2 Lists in C#). The first list containstwenty-six symbols (i.e. ~,@,#,$,%, etc.), one symbol in each cell. The second listcontains the twenty-six lower case letters of the alphabet (a – z), one letter in each cell.From there you'll create the following six (6) methods:1 Encrypt a message2 Decrypt a message3 Quit1) Add a method return_alphabet, which takes in an int (integer) and returns thealphabet stored at that position, i.e. 5 would return fEnter Choice CSE1322L Assignment 2 v5.1.pdfSearchPage 4 of 6If the user enters 1, prompt the user to enter a message, pass the result to theencrypt_message method, and print the returned encrypted string.If the user enters 2, prompt the user to enter an encrypted message, pass the encryptedmessage to the decrypt_message method, and print the returned decrypted string.If the user enters 3, terminate the program.If the user enters any character other than a 1, 2, or 3, the following error messageshould display: Error: Please enter valid input, and the user should be allowed toreenter a valid choice.Sample Output:1 Encrypt a message2 Decrypt a message3 QuitEnter Choice:1Enter the plain text message:MayTheForceBeWithYouEncrypted Msg: =!(^&,[#^@^:)/(<,|1 Encrypt a message2 Decrypt a message3 QuitEnter Choice:2Enter the encrypted message:=!</(^&,[#^@^:)/(<,|Decrypted Msg: maytheforcebewithyou1 Encrypt a message2 Decrypt a message3 QuitEnter Choice:3

symbols. Adde: symbols. Add) symbols.Add); symbols. Add(S) symbols. Add% symbols. Add& 2) Add a method retum_alphabet_index, which takes in an alphabetic character (char) and returns the index (int) of the character in the alphabets list, i.e. a would return 0, b would return 1. 3) Add a method retun_symbol, which takes in an int (integer) and returns the symbol stored at that position, i.e. 5 would return & 4) Add a method retum_symbol_index, which takes in a symbol (char) and returns the index (int) of the symbol in the symbols list, i.e. ! would retum 0, @ would symbols add() symbols.add(@): symbols.add() symbols add(S) symbols.add") symbols.add(&); symbols.add(") symbols add(): symbols.add) symbols.add symbols add symbols add) symbols.add symbols.add(); symbols add.) symbols.add() symbols.add) symbols.add(T) symbols.add() symbols add) symbols.add() symbols.add) symbols.add) symbols.add. symbols.add() symbols. Add) symbols. Add(O: symbols. Add()): symbols. Add return 1. symbols. Add-) symbols. Add) symbols. Add) symbols. Add(); symbols. Add.) symbols. Add) symbols. Add) symbols. Add(T) symbols. Add() symbols. Adde) symbols. Add) symbols. Add: symbols. Add symbols. Add. symbols. Add 5) Add a method encrypt_message, which takes in a plain-text string and returns the encrypted version of that string, i.e. Dwags would return $:1"] - The method should convert the plain-text string to lowercase (hint: Java: .toLowerCase(), C#: ToLower()) The method should process each character in the plain-text string individually, encrypting each character and building a new string of encrypted characters (hint: Java: toCharArray(), C#: ToCharArray(), return_alphabet_index(). return_symbol()) If an invalid alphabet character is found, the following string should be returned: "Error: Invalid Character 6) Add a method decrypt_message, which takes in an encrypted string and retums the decrypted version of that string, i.e. $:1"] would return dwags - The method should process each symbol in the encrypted string individually, decrypting each symbol and building a new string of decrypted characters (hint: Java: toCharArray(), C#: ToCharArray(), return_symbol_index(), return_alphabet()