Question:please the code should be in C# (C SHARP)1.1 A program that computes final averages for a set of grades,The program reads the grades from a user.The format: N grades1, grades2, …………., grade5. N is total number of grade of ith score. between 0 and 100.Calculate and display the average.The weighted average is computed as:NB: Your program should validate its input. That is, score is between 0 and 100 If a student’s grades are invalid, the program should display an error message.1.2 Extend 1.1 so that the program also determines a final letter grade.AVERAGE LETTER GRADE0-59 F60-69 D70-79 C80-89 B90-100 A
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