how to call method after pressing enter key in c#

I want to sum two numbers.
After entering the second number i will show "Please confirm the values by pressing Enter key or press Backspace key to reenter the values again". If the user pressed enter I want to execute the method. I also want that instead if user presses Backspace I want to repeat the task.

I’m a beginner in c#

ignore the comments in code

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using System;  
namespace FunctionExample  
{  
    class Program  
    {  
        // User defined function without return type  
        public int Add(int firstNum,int secondNum) // No Parameter  
        {  
           
         return firstNum + secondNum;
           
        }  
        // Main function, execution entry point of the program  
        static void Main(string[] args)  
        {  
            Console.WriteLine("Please add first number");
            int num1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Please enter second num");
            int num2 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Please Confirm the values by pressing Enter key or press Backspace to reenter the values");
            Program p = new Program();
            int sum = p.Add(num1,num2);
            Console.WriteLine("Total = ",sum);
            
            
            
                        
        }  
    }  
}

and please don’t tell me to remove the Add() method and just do that addition in main class , its a task so i have to do it like that

>Solution :

Please review below code.

static void Main(string[] args)
{
    try
    {
        while (true)
        {
            Console.Write("Please add first number (Numemic value only): ");
            int num1 = Convert.ToInt32(Console.ReadLine());
            Console.Write(Environment.NewLine + "Please enter second num (Numemic value only): ");
            int num2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine(Environment.NewLine + "Please Confirm the values by pressing Enter key or press Backspace to reenter the values");
            ConsoleKeyInfo consoleKeyInfo = Console.ReadKey();
            if (consoleKeyInfo.KeyChar == 13)
            {
                Console.WriteLine(Environment.NewLine + "Sum of " + num1 + " and " + num2 + " is: " + Add(num1, num2));
                Console.WriteLine(Environment.NewLine + "Press any key to exit.");
                Console.ReadKey();
                break;
            }
            else if (consoleKeyInfo.KeyChar == 27)
                Console.Clear();
            else
                break;
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("EXCEPTION" + Environment.NewLine + Environment.NewLine + "Exception Message - " + ex.Message + Environment.NewLine + Environment.NewLine + "Exception Stack Trace - " + ex.StackTrace + Environment.NewLine + Environment.NewLine + "Inner Exception Message - " + (ex.InnerException != null ? ex.InnerException.Message : "N/A") + Environment.NewLine + Environment.NewLine + "Inner Exception Stack Trace - " + (ex.InnerException != null ? ex.InnerException.StackTrace : "N/A") + Environment.NewLine + Environment.NewLine + "Base Exception Message - " + (ex.GetBaseException() != null ? ex.GetBaseException().Message : "N/A") + Environment.NewLine + Environment.NewLine + "Base Exception Stack Trace - " + (ex.GetBaseException() != null ? ex.GetBaseException().StackTrace : "N/A"), "EXCEPTION");
        Console.ReadKey();
    }
}

static int Add(int firstNum, int secondNum) // No Parameter  
{
    return firstNum + secondNum;
}