The Program in C# Program to convert from Celsius degrees to Kelvin and Fahrenheit are given below:

using System;

namespace CelsiusConverter
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, Enter the temperature in Celsius to convert them into Kelvin and Fahrenheit below : ");
            Console.WriteLine("Well,enter the temperature in Celsius: ");
            double celsius = Convert.ToDouble(Console.ReadLine());

            double kelvin = celsius + 273.15;
            double fahrenheit = celsius * 9 / 5 + 32;

            Console.WriteLine("Okay, the temperature in Kelvin is: " + kelvin);
            Console.WriteLine("Okay, the temperature in Fahrenheit is: " + fahrenheit);
            Console.ReadLine();
        }
    }
}

Output:

Hello Codeauri Family, Enter the temperature in Celsius to convert them into Kelvin and Fahrenheit below :
Well,enter the temperature in Celsius:
99
Okay, the temperature in Kelvin is: 372.15
Okay, the temperature in Fahrenheit is: 210.2

Pro-Tips💡

Here are the step by step execution of above program:

1. using System; is a directive that imports the System namespace, which contains various classes and methods used in the program.
2. namespace CelsiusConverter defines a namespace that contains all the classes and methods within it.
3. class Program defines a class that contains the program’s logic.
4. static void Main(string[] args) is the program’s entry point, which is executed when the program starts.
5. Console.WriteLine("Hello Codeauri Family, Enter the temperature in Celsius to convert them into Kelvin and Fahrenheit below : "); prints a greeting message.
6. Console.WriteLine("Well,enter the temperature in Celsius: "); prints a prompt asking the user to enter the temperature in Celsius.
7. double celsius = Convert.ToDouble(Console.ReadLine()); reads the user’s input, converts it from a string to a double using Convert.ToDouble, and stores the result in the variable celsius.
8. double kelvin = celsius + 273.15; calculates the temperature in Kelvin by adding 273.15 to the temperature in Celsius.
9. double fahrenheit = celsius * 9 / 5 + 32; calculates the temperature in Fahrenheit using the formula (celsius * 9 / 5) + 32.
10. Console.WriteLine("Okay, the temperature in Kelvin is: " + kelvin); and Console.WriteLine("Okay, the temperature in Fahrenheit is: " + fahrenheit); print the temperature in Kelvin and Fahrenheit, respectively.
11. Console.ReadLine(); waits for the user to press the Enter key before ending the program.