How can I finish this? [on hold]

I'm new to programming. I plan to make this get executed in another class called Class ExecuteCategory where the main method is where I would like to make an if-else statement where it can make the user input the category of either MySavings or Grade and it will show the one under the category.

I can't seem to make the if-else statement in the main method because it gets a lot of errors. Can anyone send me an example of what I can do?

using System;

namespace HandsOn3
{
    public class Program
    {
        class Category
        {
            public void MySavings ()
            {
                int Allowance, Savings,Food, Transpo, WFood, WTranspo, WSavings, MFood,MTranspo, MSavings;

                Console.WriteLine("Input daily allowance:");
                Allowance = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input daily food expense:");
                Food = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input daily transportation expense:");
                Transpo = Convert.ToInt32(Console.ReadLine());

                Savings = Allowance - (Food + Transpo);
                Console.WriteLine("Daily savings: {0}", Savings);
                Console.ReadLine();

                WFood = Food * 5;
                Console.WriteLine("Weekly Food expense: {0}",WFood);
                Console.ReadLine();
                WTranspo = Transpo * 5;
                Console.WriteLine("Weekly Food expense: {0}", WFood);
                Console.ReadLine();
                WSavings = Savings * 5;
                Console.WriteLine("Weekly Food expense: {0}", WSavings);
                Console.ReadLine();

                MFood = WFood * 4;
                Console.WriteLine("Monthly Food expense: {0}", MFood);
                Console.ReadLine();
                MTranspo = WTranspo * 4;
                Console.WriteLine("Monthly Food expense: {0}", MFood);
                Console.ReadLine();
                MSavings = WSavings * 4;
                Console.WriteLine("Monthly Food expense: {0}", MSavings);
                Console.ReadLine();

                Console.ReadKey();

            }

            public void Grades()
            {
                int Filipino, English, Math, Science, History, Average;

                Console.WriteLine("Input grade in Filipino:");
                Filipino = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input grade in English:");
                English = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input grade in Math:");
                Math = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input grade in Science:");
                Science = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Input grade in History:");
                History = Convert.ToInt32(Console.ReadLine());

                Average = (Filipino + English + Math + Science + History) / 5;
                Console.WriteLine("Average is: {0}", Average);
                Console.ReadKey();
            }
        }

        class ExecuteCategory
        {
            static void Main(string[] args)