Need all of thosed answered please

10. What CH Code would you need to read from a file called "secretfiles txt". Write ALL necessary CH+ line codes. Can you skip ahead to the middle of the file? How would you determine you have reached the end of the file? ANSWER: 11. For the following letters: COMPUTER Write CH Code to store them as characters. Write CH Code to store them as a string. How would you get the length of those characters in the string? ANSWER: 12. What CH Code would you need to write to a file called "openbook.txt" Write ALL necessary C# line codes. ANSWER: 13. Rewrite the following CH Code in extended format z> 15.2 x= 25 : y = 30