The Program in C# Sharp program to check whether an alphabet is a vowel or consonant is given below:

using System;

namespace VowelOrConsonant
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family,enter an alphabet here to check if its a vowel or consonant: ");
            char ch = char.Parse(Console.ReadLine());

            if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' ||
                ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U')
            {
                Console.WriteLine(ch + " is a vowel.");
            }
            else
            {
                Console.WriteLine(ch + " is a consonant.");
            }
        }
    }
}

Output:

Hello Codeauri Family,enter an alphabet here to check if its a vowel or consonant:
c

c is a consonant.

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Here are the step by step execution of above program:

1. The code starts with the “using System” directive, which brings in the System namespace and makes its members available in the code.
2. The code then defines a namespace “VowelOrConsonant”, which is a way of organizing code into logical groups.
3. Within the namespace, there is a class “Program” that contains the code logic.
4. In the class, the Main method is the entry point of the program, which gets executed first when the program runs.
5. The Main method starts by printing a message on the console asking the user to enter an alphabet.
6. The code then reads the input from the console and converts it to a char variable “ch”.
7. The code then checks if “ch” is one of the ten vowels (uppercase or lowercase) and prints a message indicating that the alphabet is a vowel.
8. If “ch” is not one of the ten vowels, the code prints a message indicating that the alphabet is a consonant.
9. The code ends with the closing of the Main method and the class, and the namespace.