Ask user to enter the grades of $129$ students for the Introduction to Programming and Algorithms course using

array data type. Display these grades, find their total and average. $(30$ points$)$

Calculate the area using the method. Make one method that returns a value and the other method that does

not return a value $($void$).$ Rectangle $=a*$ b$,$ Square $=a*a(35$ points$)$

$1-$Rectangle

$2-$Square

$3-$Exit

Define a list data type of numbers with $8$ elements. Give values to these lists. $(35$ points$)$

a$)$ Display the $5$ th element of this list.

b$)$ Display all elements of this list.

c$)$ Add a new element to this list.

d$)$ Delete Element $4$ from this list.

e$)$ Find any value in this list

Use C# language

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