Question

the problem i am having is that i can get the file to ready but my read code only seems to read 1 value in a 2 value list.i am stumped as to where this is going wrong. code as follows :

 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 System.IO;
 using System.Runtime.Serialization.Formatters.Binary;

 namespace test
 {

public partial class Form1 : Form
{
    [Serializable]
    public class ore
    {
        public float Cost;

    }



    private List<ore> oreData = new List<ore>();
    private ore b1 = null;
    private ore b2 = null;
    public Form1()
    {
        InitializeComponent();
        b1 = new ore();
        b2 = new ore();
        oreData.Add(b1);
        oreData.Add(b2);

    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        // 1st text box input is float
        float tempFloat;


        if (float.TryParse(textBox1.Text, out tempFloat))
        {
            oreData[0].Cost = tempFloat;
        }
        else
            MessageBox.Show("uh oh");



    }


    private void textBox2_TextChanged(object sender, EventArgs e)
    {
        // 2nd text box input is float
        float tempFloat;
        if (float.TryParse(textBox1.Text, out tempFloat))
        {
            oreData[1].Cost = tempFloat;
        }
        else
            MessageBox.Show("uh oh");


    }


    private void button1_Click(object sender, EventArgs e)
    {
        FileStream fs = new FileStream("ore.dat", FileMode.Create);
        BinaryFormatter bf = new BinaryFormatter();
        bf.Serialize(fs, oreData);
        fs.Close();
    }

    private void textBox3_TextChanged(object sender, EventArgs e)
    {
        // 3rd text box 
    }

    private void textBox4_TextChanged(object sender, EventArgs e)
    {
        //4th text box
    }


    private void button2_Click(object sender, EventArgs e)
    {
        FileStream fs = new FileStream("ore.dat", FileMode.Open);
        BinaryFormatter bf = new BinaryFormatter();
        oreData = (List<ore>)bf.Deserialize(fs);
        fs.Close();

        if (oreData!=null)
        {
            if (oreData.Count > 0)
                textBox3.Text = oreData[0].Cost.ToString();//update the 3rd text box
            if (oreData.Count > 1)
                textBox4.Text = oreData[1].Cost.ToString();//update the 4th text box

        }
    }
}
}

Answer 1

I found your problem! (Oh my eyes hurt!)

Look at the if statement in your textbox1_changed and textbox2_changed methods. They are both

if (float.TryParse(textBox1.Text, out tempFloat))

But the second one should say

if (float.TryParse(textBox2.Text, out tempFloat))

Notice that textbox1 is changed to textbox2. This should solve your problem.