8 Write a program that reads a file called ClassGrades.txt stored in ...\bin \ Debug that calculates the average grade, the minimum grade and the maximum grade from the grades included in the file. ( 30 points) using System; using Sxstem Collections Generic; using Systemeling; using Sxstem Text; using System Threading,Tasks; using System.IO; namespace Classstats \{ class Program \{ static void Main(string[] args) \{