我的文本文件将不会读取到数组中

此问题已得到回答。我对C#还比较陌生，遇到了一个问题。我的程序每次尝试捕获都会抛出一个错误。我检查了所有的东西，改变了一些东西，但似乎什么都不起作用。错误发生在第49行(读取文本文件的while循环发生在该行(。有人知道可能是什么问题吗？？我知道最小值/最大值/平均值可能还有其他问题，但我能解决。我只是真的需要有人帮我修复将文件读取到数组中的问题。

错误代码为：输入字符串的格式不正确。位于System.Number.StringToNumber使用System.Collections.Generic；使用System.ComponentModel；使用System.Data；使用System.Drawing；使用System.Linq；使用System.Text；使用System.Windows.Forms；使用System.IO；

namespace Total_Sales_BBrantley
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    private void btnCalc_Click(object sender, EventArgs e)
    {
        try
        {
            // Declare variable to hold the amount of sales
            // Declare a constant for the array size
            const int SIZE = 100;
            // Create an array for the sales
            double[] allSales = new double[SIZE];
            // Declare a variable for holding the total value of sales
            double total = 0.0;
            // Declare a variable to hold the average
            double average;
            // Declare a variable to hold the highest value
            double highest = double.MinValue;
            // Declare a variable to hold the lowest value
            double lowest = double.MaxValue;
            int count = 0;
            // Declare a StreamReader variable.
            StreamReader readFile;
            // Open the file and get a StreamReader object using a relative path
            readFile = File.OpenText("Sales.txt");
            while (!readFile.EndOfStream && count < allSales.Length)
            {
             ERROR ERROR ERROR: [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[   allSales[count] = int.Parse(readFile.ReadLine()); ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
                // Increment count
                count++;

        } 
            // Close the file
            readFile.Close();
            lstSales.Items.Add("The file contains " + count + " items:");
            for (int index = 0; index < count; index++)
            {
                lstSales.Items.Add(allSales[index]);
            }

            // Display the total
            double sum = allSales.Sum();
            lblTotal.Text = sum.ToString();
            total += sum;
            average = total / allSales.Length;
            lblAverage.Text = average.ToString();
            for (int index = 1; index < allSales.Length; index++)
            {
                if (allSales[index] > highest)
                {
                    highest = allSales[index];
                }
                lblHighest.Text = highest.ToString();
            }
            for (int index = 1; index < allSales.Length; index++)
            {
                if (allSales[index] < lowest)
                {
                    lowest = allSales[index];
                }
                lblLowest.Text = lowest.ToString();
            }
        }
        catch (Exception ex)
        {
            // Display an error message on bad input from file 
            MessageBox.Show(string.Concat("Error calculating the sales. ", ex.Message,     "'r'n", ex.StackTrace));
        }
    }
    private void btnExit_Click(object sender, EventArgs e)
    {
        //Closes the application
        this.Close();
    }
}

}

allSales[count] = int.Parse(readFile.ReadLine());

allSales[count] = Double.Parse(readFile.ReadLine());