Please Help Me with this error

Question

It only works if the button is presses once. if you try to add other data to be shown under the first data that you inputted. the program crash and gives and error  
This is my code for the Class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WpfApplication3
    class Person
        private Queue<string> Name = new Queue<string>();
        private Queue<string> Surname = new Queue<string>();
        private Queue<string> Course = new Queue<string>();
        private Queue<int> CRNumber = new Queue<int>();
        public string name
            get
                return Name.Peek();
            set
                Name.Enqueue(value);
        public string surname
            get
                return Surname.Peek();
            set
                Surname.Enqueue(value);
        public string course
            get
                return Course.Peek();
            set
                Course.Enqueue(value);
        public int crnumber
            get
                return CRNumber.Peek();
            set
                CRNumber.Enqueue(value);
        public void Constructor()
            Name.Enqueue("default");
            Surname.Enqueue("default");
            Course.Enqueue("default");
            CRNumber.Enqueue(0);
        public void Constructor(string name, string surname, string course, int crnumber)
            Name.Enqueue(name);
            Surname.Enqueue(surname);
            Course.Enqueue(course);
            CRNumber.Enqueue(crnumber);
        public String View(int Count)
            int i = 0;
            string Output = "";
            while (i <= Count)
                Output += "Student Info : " + "\n" + "Name : " + Name.Dequeue() + "\n" + "Surname : " + Surname.Dequeue() + "\n"
+ "Course : " + Course.Dequeue() + "\n" + "Class room number : " + Convert.ToString(CRNumber.Dequeue()) + "\n";
                i++;
            return Output;
And this is my MainWindow code where i try to call the class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication3
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
        public MainWindow()
            InitializeComponent();
        int Count = 0;
        private void AddButton_Click(object sender, RoutedEventArgs e)
            Person Student = new Person();
            Student.Constructor(txtBox1.Text, txtBox2.Text, txtBox3.Text, Convert.ToInt32(txtBox4.Text));
            TextBlock1.Text = Student.View(Count);
            //TextBlock.Text = Student.View(Count);
            Count++;
Please Help as soon as possible.

Answer 1

Hi Joubert,
The problem is clear. In this piece of code:
while (i <= Count)
Output += "Student Info : " + "\n" + "Name : " + Name.Dequeue() + "\n" + "Surname : " + Surname.Dequeue() + "\n" + "Course : " + Course.Dequeue() + "\n" + "Class room number : " + Convert.ToString(CRNumber.Dequeue()) + "\n";
i++;
You are calling the Dequeue() operation from the queues. Dequeue() will remove the next element and return it.
When you click the button the second time, the while loop will be carried out two times. The second time, it tries to dequeue but there is nothing in the queue. That is why you get the exception.
Also, your code looks very messy to me. I do not think the queues are appropriate collections for what you are trying to do. There are a couple of things wrong here.
If you provide some info on what your goals is, I could give you some pointers on what to fix.
Rgds MM
PS: Pls mark as answer if helpful. Thanks!