Basic C# Programs

1 Hello World program Easy 2 Swap two numbers without third variable Easy 3 Check even or odd Easy 4 Factorial of a number Medium 5 Fibonacci series (first 10 terms) Medium 6 Prime number check Medium 7 Print numbers 1 to 5 Easy 8 Sum of first 6 natural numbers Easy 9 Factorial of 7 Medium 10 Check if 7 is prime Medium 11 First 9 Fibonacci numbers Medium 12 Count evens from 1 to 10 Easy 13 GCD of 11 and 18 Medium 14 Print numbers 1 to 12 Easy 15 Sum of first 13 natural numbers Easy 16 Factorial of 14 Medium 17 Check if 2 is prime Medium 18 First 8 Fibonacci numbers Medium 19 Count evens from 1 to 17 Easy 20 GCD of 18 and 25 Medium 21 Print numbers 1 to 19 Easy 22 Sum of first 20 natural numbers Easy 23 Factorial of 21 Medium 24 Check if 19 is prime Medium 25 First 7 Fibonacci numbers Medium 26 Count evens from 1 to 24 Easy 27 GCD of 5 and 12 Medium 28 Print numbers 1 to 6 Easy 29 Sum of first 7 natural numbers Easy 30 Factorial of 8 Medium 31 Check if 11 is prime Medium 32 First 6 Fibonacci numbers Medium 33 Count evens from 1 to 11 Easy 34 GCD of 12 and 19 Medium 35 Print numbers 1 to 13 Easy 36 Sum of first 14 natural numbers Easy 37 Factorial of 15 Medium 38 Check if 3 is prime Medium 39 First 5 Fibonacci numbers Medium 40 Count evens from 1 to 18 Easy 41 GCD of 19 and 26 Medium 42 Print numbers 1 to 20 Easy 43 Sum of first 21 natural numbers Easy 44 Factorial of 22 Medium 45 Check if 23 is prime Medium 46 First 12 Fibonacci numbers Medium 47 Count evens from 1 to 5 Easy 48 GCD of 6 and 13 Medium 49 Print numbers 1 to 7 Easy 50 Sum of first 8 natural numbers Easy