The Program in C# Program to Check if Given String contains two Similar Consecutive letters is given below:

using System;

namespace ConsecutiveLetterChecker
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, enter a string here to check for consecutive letters: ");
            string input = Console.ReadLine();
            
            // Check for consecutive letters
            bool hasConsecutiveLetters = false;
            for (int i = 0; i < input.Length - 1; i++)
            {
                if (input[i] == input[i + 1])
                {
                    hasConsecutiveLetters = true;
                    break;
                }
            }
            
            // Display the result
            Console.WriteLine("Does the input contain consecutive letters? " + hasConsecutiveLetters);
            Console.ReadKey();
        }
    }
}

Output:

Hello Codeauri Family, enter a string here to check for consecutive letters: codee
Does the input contain consecutive letters? True

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Here are the step by step execution of above program:

1. The program starts with a using statement that references the System namespace, which provides access to the Console class that is used for input and output.
2. The program defines a namespace called ConsecutiveLetterChecker, which helps organize the code and prevents naming conflicts.
3. Within the namespace, there is a class called Program which contains the main method Main that is executed when the program runs.
4. The Main method starts by displaying a message asking the user to input a string. The user’s input is stored in a variable called input.
5. Next, the program uses a for loop to check if there are any consecutive letters in the input string. The loop iterates over the characters in the string and compares each character to the next one. If two consecutive characters are the same, the hasConsecutiveLetters variable is set to true and the loop is exited using a break statement.
6. Finally, the result of the check is displayed to the user using the Console.WriteLine method. The message displays whether the input string contains consecutive letters or not. The program waits for the user to press a key before it exits, using the Console.ReadKey method.