Erro na linguagem cSharp

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            int opcao = 1;

            while (opcao != 0)
            {
                Console.Clear();
                Console.WriteLine(" [Menu de Opções]");
                Console.WriteLine("1 - Média aritmética");
                Console.WriteLine("2 - Média ponderada");
                Console.WriteLine("0 - Sair");
                Console.WriteLine("Opção: ");

                try
                {
                    //Provalmente alguma coisa no buffer quebra o parse
                    opcao = int.Parse(Console.ReadLine()); // (ERRO NESTA LINHA)
                }
                catch { }

                switch (opcao)
                {
                    case 1:
                        {
                            mediaAri();
                            Console.Clear();
                            break;
                        }
                    case 2:
                        {
                            mediaPon();
                            Console.Clear();
                            break;
                        }
                    case 0:
                        {
                            Console.WriteLine("Finalizando...");
                            Console.ReadKey();
                            
                            break;
                        }
                    default:
                        {
                            Console.WriteLine("Opção Invalida...");
                            Console.Read();
                            Console.Clear();
                            break;
                        }
                    
                }
               
            }

            if(opcao == 0)
            {
                Environment.Exit(0);
            }
        }
        static void mediaAri()
        {
            Console.Clear();
            float num1, num2, media;

            Console.WriteLine(" [Média aritimética]");
            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nDigite o primeiro número: ");
            num1 = float.Parse(Console.ReadLine());
            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nDigite o segundo número: ");
            num2 = float.Parse(Console.ReadLine());

            media = (num1 + num2) / 2;

            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nMédia: {0:N2}", media);

            //Para conseguir voltar ao menu inicial
            Console.WriteLine("Enter para voltar");
            Console.ReadKey();
        }
        static void mediaPon()
        {
            Console.Clear();
            float nota1, nota2, nota3, p1, p2, p3, media;

            Console.WriteLine(" [Média Ponderada]");
            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nDigite a primeira nota: ");
            nota1 = float.Parse(Console.ReadLine());
            Console.WriteLine("Peso: ");
            p1 = float.Parse(Console.ReadLine());
            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nDigite a segundo nota: ");
            nota2 = float.Parse(Console.ReadLine());
            Console.WriteLine("Peso: ");
            p2 = float.Parse(Console.ReadLine());
            Console.WriteLine("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\nDigite a terceira nota: ");
            nota3 = float.Parse(Console.ReadLine());
            Console.WriteLine("Peso: ");
            p3 = float.Parse(Console.ReadLine());

            media = ((nota1 * p1) + (nota2 * p2) + (nota3 * p3)) / 3;

            //Mudei
            Console.WriteLine("Média: ", media);
            Console.WriteLine("Enter para voltar");
            //Para conseguir voltar ao menu inicial
            Console.ReadKey();

        }
    }
}