So this can be a fairly easy code, I believe it was?

It asks for the consumer’s start day and month, and provides it again with the day a reduction reminder e-mail might be despatched (the day earlier than their birthday)

Now I attempted to optimize as a lot as I may, attainable unsuitable inputs and if the consumer’s birthday is the primary of a month

Regardless that I am nonetheless fairly new to coding, I nonetheless need you to criticize my code as a lot as I may, I wish to enhance as a lot as I can

utilizing System.Textual content.RegularExpressions;
utilizing System.Linq;

namespace Exercice14
{
    class Program
    {
        static void Essential(string[] _)
        {
            // declaring some variables
            int birthDay;
            int reminderDay;
            string suffix = "th";
            string reminderSuffix = "th";
            string birthDayT;
            string birthMonth;
            string reminderMonth;
            string[] months = {"January", "February", "March", "April", "Might", "June", "July", "August", "September", 
                                 "October", "November", "December" };
            bool exceptionFirst = false;

            // prompts for start month and capitalize first letter
            Console.WriteLine("Hiya Consumer!");
            Console.Write("Please enter your start month in letters: ");
            birthMonth = Console.ReadLine();
            birthMonth = char.ToUpper(birthMonth[0]) + birthMonth.Substring(1);


            // examine if start month accommodates solely letters
            whereas(Regex.IsMatch(birthMonth, @"^[a-zA-Z]+$") == false)
            {
                Console.WriteLine("Beginning month ought to solely include letters!");
                Console.Write("Please enter your start month in letters: ");
                birthMonth = Console.ReadLine();
                birthMonth = char.ToUpper(birthMonth[0]) + birthMonth.Substring(1);
            }

            // examine if month is correct
            whereas (months.Comprises(birthMonth) == false)
            {
                Console.WriteLine("Invalid month?! Please enter a legitimate english month");
                Console.Write("Please enter your start month: ");
                birthMonth = Console.ReadLine();
                birthMonth = char.ToUpper(birthMonth[0]) + birthMonth.Substring(1);
            }

            // prompts for start day
            Console.Write("Please enter your start day in numbers: ");
            birthDayT = Console.ReadLine();

            // examine for legitimate day 
            whereas (int.TryParse(birthDayT, out int _) == false)
            {
                Console.WriteLine("Invalid argument! Please enter day in numerals");
                Console.Write("Please enter your start day in numbers: ");
                birthDayT = Console.ReadLine();
            }

            // examine for legitimate day quantity
            whereas (int.Parse(birthDayT) < 1 || int.Parse(birthDayT) > 31)
            {
                Console.WriteLine("Invalid date! Please enter a day between 1 and 31");
                Console.Write("Please enter start day in numbers: ");
                birthDayT = Console.ReadLine();
            }

            // assign start day to variable as soon as examined
            birthDay = int.Parse(birthDayT);

            // set reminder day and month
            reminderDay = birthDay - 1;
            reminderMonth = birthMonth;

            // examine which suffix to make use of for days AND calculate reminder day and month if exception
            if (birthDay == 1) //exception
            {
                exceptionFirst = true;
                suffix = "st";
                reminderMonth = months[Array.IndexOf(months, birthMonth) - 1];
            }
            if (birthDay == 2)
            {
                suffix = "nd";
                reminderSuffix = "st";
                reminderDay = 1;
            }
            if (birthDay == 3)
            {
                suffix = "th";
                reminderSuffix = "nd";
            }
            if (birthDay > 3)
            {
                suffix = "th";
                reminderSuffix = "th";
            }

            // print values
            Console.WriteLine();
            Console.WriteLine("Yer birthday is on the " + birthDay + suffix + " of " + birthMonth );

            if (exceptionFirst == true)
            {
                Console.WriteLine("A reminder e-mail on your birthday low cost " +
                    "nwill be despatched on the final day of " + reminderMonth);
            }
            else
            {
                Console.WriteLine("A reminder e-mail on your birthday low cost " +
                    "nwill be despatched on the " + reminderDay + reminderSuffix + " of " + reminderMonth);
            }

        }
    }
}