The Program in C# Program to Reverse Words of a Sentence is given below:

using System;

namespace ReverseWords
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter a sentence to reverse the words: ");
            string inputString = Console.ReadLine();
            string[] words = inputString.Split(' ');
            Array.Reverse(words);
            string reversedSentence = string.Join(" ", words);

            Console.WriteLine("The reversed sentence is: " + reversedSentence);
        }
    }
}

Output:

Hello Codeauri Family, enter a sentence here to reverse the words:keep programming
Okay, the reversed sentence is: programming keep

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Here are the step by step execution of above program:

1. The using System; statement is a directive that imports the System namespace, which contains the Console and Array classes used in the code.
2. The namespace ReverseWords is declared, which is a way of organizing code and preventing naming collisions.
3. The class Program is declared, which is the main class of the code and contains the entry point of the program, the Main method.
4. The Main method is defined, which is the starting point of the program and contains the logic for reversing the words in a sentence.
5. The Console.WriteLine(“Enter a sentence to reverse the words: “) statement outputs a prompt to the console asking the user to enter a sentence.
6. The string inputString = Console.ReadLine() statement reads the input from the user and stores it in the inputString variable.
7. The string[] words = inputString.Split(‘ ‘) statement splits the input string into an array of strings, with each string representing a word, using the Split method and the space character as a separator.
8. The Array.Reverse(words) statement reverses the order of the elements in the words array.
9. The string reversedSentence = string.Join(” “, words) statement concatenates the reversed words into a string, separated by spaces, using the Join method.
10. The Console.WriteLine(“The reversed sentence is: ” + reversedSentence) statement outputs the reversed sentence to the console.
11. The Main method ends and the program terminates.