从windows窗体的文本框中获取数据

我正在使用Visual Studio制作一个windows窗体。我正在为大学的作业制作一款基于文本的生存游戏，但是我被卡住了。

我的目标是让用户输入一个选择(1-4)到一个textbox，使他们的选择。

我尝试使用4不同的按钮，但似乎无法得到一个if语句与按钮点击工作。然后我尝试了一个带有按钮的开关，然后是一个带有文本的开关，现在是一个带有if/else if语句的文本框。

下面是我的代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.VisualBasic;

namespace PF5
{
public partial class Form1 : Form
{
    int iScore = 0, iChoice;
    String sName;
    public Form1()
    {
        //asks user to input their name before the game begins
        sName = Microsoft.VisualBasic.Interaction.InputBox("Please enter    your name:", "What is Your Name?", "");
        //if no name is entered, they are asked again
        while (sName == "")
        {
            MessageBox.Show("Please enter your name.");
            sName = Microsoft.VisualBasic.Interaction.InputBox("Please enter your name:", "What is Your Name?", "");
        }

        InitializeComponent();
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        //displays the score
        lblScore.Text = iScore.ToString();
        //displays the scoring system in the Rules textbox
        txtRules.Text = "Welcome to SURVIVE,  " + sName + ", during your   time here you will be presented with numerous scenarios and you will be given FOUR options or choices." + Environment.NewLine + "" + Environment.NewLine + "For each Scenario there will be: " + Environment.NewLine + "" + Environment.NewLine + "ONE 'Perfect Answer' which will give you +2 points to your score. " + Environment.NewLine + "" + Environment.NewLine + "ONE 'Correct Answer' which will award you +1 point to your total. " + Environment.NewLine + "" + Environment.NewLine + "ONE 'Wrong Answer' which will award you +0 points." + Environment.NewLine + "" + Environment.NewLine + "ONE 'Fatal Answer' which will result in Game Over, Death and -1 point.";
    }

    private void btnExit_Click(object sender, EventArgs e)
    {
        // Display a message box asking users if they
        // want to exit the application.
        if (MessageBox.Show("Do you want to exit?", "SURVIVE",
         MessageBoxButtons.YesNo, MessageBoxIcon.Question)
         == DialogResult.Yes)
        {
            Application.Exit();
        }
    }
    private void btnStart_Click(object sender, EventArgs e)
    {
        //Displays story and Options for the user
        txtStory.Text = "After a heavy night in town, you wake up the following day with the worst headache ever. The night seems to be a blur. The usual business of outside seems to be quiter than normal, even for a Sunday, but you don't think too much about it." + Environment.NewLine + " After you have had a shower, a coffee and got ready you feel slightly better, you turn on the TV to watch your favorite channel, only to see some pandemic on the news, apparently a ZOMBIE OUTBREAK!" + Environment.NewLine + "Luckily for you though, you have played Black Ops Zombies and Minecraft for most of your student life so you know exactly what to do..."
            + Environment.NewLine + "" + Environment.NewLine + "Option 1: Run outside and ask the first person you see to help you" + Environment.NewLine + "" + Environment.NewLine + "Option 2: Take some time to get some food and money together and pack them along with extra clothes into your bag." + Environment.NewLine + "" + Environment.NewLine + "Option 3: Text your friends and see if they are okay." + Environment.NewLine + "" + Environment.NewLine + "Option 4: Call the police to let them know a Zombie Outbreak is happening";
        btnStart.Visible = false;
            txtChoice.Text = Convert.ToString(iChoice);
            iChoice = Convert.ToInt32(Console.ReadLine());
            if  (iChoice == 1)
            {
                    txtResult.Text = "You run outside and grab the first person you see by the shoulder, apparently this particular person just wanted to chomp on your flesh." + Environment.NewLine + "" + Environment.NewLine + "YOU DIED!!!";
                    iScore = -1;
                    lblScore.Text = iScore.ToString();
            }
    }
}
}

我希望有人能帮忙。我对它的其余部分很满意，只是if语句atm，它只是不会检测到textbox中的条目，我也在考虑使用提交答案按钮，但我不知道如何让它工作。

值得一提的是，我不是一个高级用户(正如你可能知道的)

private void btnStart_Click(object sender, EventArgs e)
    {
        //Displays story and Options for the user
        txtStory.Text = "After a heavy night in town, you wake up the following day with the worst headache ever. The night seems to be a blur. The usual business of outside seems to be quiter than normal, even for a Sunday, but you don't think too much about it." + Environment.NewLine + " After you have had a shower, a coffee and got ready you feel slightly better, you turn on the TV to watch your favorite channel, only to see some pandemic on the news, apparently a ZOMBIE OUTBREAK!" + Environment.NewLine + "Luckily for you though, you have played Black Ops Zombies and Minecraft for most of your student life so you know exactly what to do..."
            + Environment.NewLine + "" + Environment.NewLine + "Option 1: Run outside and ask the first person you see to help you" + Environment.NewLine + "" + Environment.NewLine + "Option 2: Take some time to get some food and money together and pack them along with extra clothes into your bag." + Environment.NewLine + "" + Environment.NewLine + "Option 3: Text your friends and see if they are okay." + Environment.NewLine + "" + Environment.NewLine + "Option 4: Call the police to let them know a Zombie Outbreak is happening";
        btnStart.Visible = false;
        iChoice = Int32.Parse(txtChoice.Text);
        if (iChoice == 1)
        {
            txtResult.Text = "You run outside and grab the first person you see by the shoulder, apparently this particular person just wanted to chomp on your flesh." + Environment.NewLine + "" + Environment.NewLine + "YOU DIED!!!";
            iScore = -1;
            lblScore.Text = iScore.ToString();
        }
    }