A few things to remember from math
С# (sharp) to work with console

Lesson # 5: Functions/Methods
Lesson # 6: Enumerations
Lesson # 7: Single dimension Arrays. Random function
Lesson # 8: Generic Methods. Solution, project, assembly
Lesson # 9: Using Generic method and Classes while working with Single-Dimensional Arrays
Lesson # 10: Two-Dimensional Arrays
Lesson # 11: Strings
Lesson # 12: Regular Expressions
Lesson # 14: Working with files. Reading from a file
Lesson # 15: Working with files. Writing data to a file
Lesson # 16: C# classes
Lesson # 17: Abstract Data Types

С# (sharp) работа с консолью
Урок 1: Структура проекта C# (sharp), типы данных, переменные
Урок 2: Условные операторы if, if else, множественные условия switch
Урок 3: Циклы: for
Урок 4: Циклы: While и Do..while