Creating a random number game as a client/server game

[KungPoo]

I decided to try to make it just as a standalone console application to make sure that I am doing it properly, and then move into the server/client relationship.

Here is what I have so far.

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string userChoice = ("");
            while (userChoice == "")
            {
            Thread.Sleep(1000);
            Console.WriteLine("Hello. Welcome to the World of Random Numbers. Please select an option.");
            Console.WriteLine("");
            Console.WriteLine("1. Start random number game.");
            Console.WriteLine("2. Instructions.");
            Console.WriteLine("3. Exit.");
            
            
                userChoice = Console.ReadLine();

                {
                    if (userChoice == "2")
                    {
                        Console.WriteLine("The server will ask you for a higher and lower number. Please select the range");
                        Console.WriteLine("of the game you would like to play.");
                        userChoice = ("");
                    }
                    else if (userChoice == "3")
                    {
                        Console.WriteLine("Thanks for coming. Have a great day.");
                        Thread.Sleep(2000);
                        Environment.Exit(1);
                        userChoice = ("");
                    }
                    else if (userChoice == "1")
                    {                     
                        PlayGame myGame = new PlayGame();
                        string playAgain = "y";
                        while (playAgain == "y")
                            
                        {

                            Console.WriteLine("Please enter the lowest number in the guessing game...");
                            myGame.userLow = Console.Read();
                            Console.WriteLine("Please enter the highest number in the guessing game...");
                            myGame.userHigh = Console.Read();
                            Console.WriteLine("Ok, I have picked a random number between " + myGame.userLow + "and" + myGame.userHigh + ". Please make a guess at which number I have chosen");
                            myGame.userGuess = Console.Read();
                            if (myGame.userGuess == myGame.serverNumber)
                            {
                                Console.WriteLine("Congratulations! You guess the correct number!");
                                Console.WriteLine("Would you like to play again?");
                                playAgain = Console.ReadLine();
                            }
                            else if (myGame.userGuess != myGame.serverNumber)
                            {
                                Console.WriteLine("Sorry, please try again...");
                                myGame.userGuess = Console.Read();
                            }
                        }
                        
                    }
                    else
                    {
                        Console.WriteLine("Sorry, that is not a valid option. Please try again");
                        userChoice = ("");

                    }
                }

            }

        }

    }
}

After these lines:

Console.WriteLine("Please enter the lowest number in the guessing game...");
                            myGame.userLow = Console.Read();
                            Console.WriteLine("Please enter the highest number in the guessing game...");
                            myGame.userHigh = Console.Read();

I need to have int serverNumber generated as a rnadom number between userLow and userHigh, but I keep getting an error stating that I cannot implicitly convert string to int, and vice versa if I try any other ways.