file handling with arraylist

hiya folks, im trying to do a program whereby i read in file records and provide valid and invalid data reports....i have done it with an arraylist and the use of the errorprovider tooltip.. but how do i show invalid entries to a report if invalid entry is added by the user?..

would it be better to use a txt file maybe?..heres the code ive created so far..thank you..






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;

namespace WinUseOfArrays
{
public partial class Form3 : Form
{





// Arrays -- Parallel Structure
// Global Data Declaration
int[] videoNo = new int[96];



string[] title = new string[500];
string[] category = new string[500];
double[] hireCharge = new double[500];
int size;
int index;

public Form3()
{
InitializeComponent();
}

private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}

private void Form1_Load(object sender, EventArgs e)
{








//Intialise Arrays + set size
videoNo[0] = 0001; title[0] = "Jim Simpson"; category[0] = "Strand Road"; hireCharge[0] = 25000;
videoNo[1] = 0002; title[1] = "Laura O'Reilly"; category[1] = "City Factory"; hireCharge[1] = 18000;
videoNo[2] = 0003; title[2] = "Sally Stevens"; category[2] = "Glendermott Road"; hireCharge[2] = 19500;
videoNo[3] = 0004; title[3] = "Brian O'Hara"; category[3] = "Northside"; hireCharge[3] = 23500;
videoNo[4] = 0005; title[4] = "Kevin Mc Laughlin "; category[4] = "Strand Road"; hireCharge[4] = 19500;
videoNo[5] = 0010; title[5] = "Mary Hegarty"; category[5] = "City Factory"; hireCharge[5] = 27500;
videoNo[6] = 0015; title[6] = "Joe Mc Dermot "; category[6] = "Strabane"; hireCharge[6] = 26500;
videoNo[7] = 0020; title[7] = "Peter Hampson"; category[7] = "Strabane"; hireCharge[7] = 19500;
videoNo[8] = 0025; title[8] = "Patrick Smith"; category[8] = "City Factory"; hireCharge[8] = 28000;
videoNo[9] = 0030; title[9] = "James Mc Daid "; category[9] = "Glendermott"; hireCharge[9] = 18000;
videoNo[10] = 0040; title[10] = "Kim Ferguson"; category[10] = "Strand Road"; hireCharge[10] = 34000;
videoNo[11] = 0045; title[11] = "Jill Simms"; category[11] = "Star Factory"; hireCharge[11] = 35000;
videoNo[12] = 0050; title[12] = "Paddy Doherty"; category[12] = "Strabane"; hireCharge[12] = 23000;
videoNo[13] = 0070; title[13] = "Patsy Wheeler"; category[13] = "Limavady"; hireCharge[13] = 22500;
videoNo[14] = 0080; title[14] = "John Quigg"; category[14] = "Strand Road"; hireCharge[14] = 25000;


size = 15;


//Paging Controls
btnFirst.Enabled = true;
btnNext.Enabled = false;
btnPrevious.Enabled = false;
btnLast.Enabled = false;
index = 0;

panVideoDetails.Visible = true;




}

private void btnDisplay_Click(object sender, EventArgs e)
{
//Local Variables
int x;
String s;
txtVideoDetails.Text =
txtVideoDetails.Text = "**** Staff ID **** **** Staff Name **** **** Campus Name **** **** Salary ****\n****************************************************************************************** ";

for (x = 0; x < size; x++)
{
// \r\n Carrage Return Character into text to force a new Line
s = String.Format("\r\n\n{0,10}\t{1,30}{2,20}{3,15:c}", videoNo[x], title[x], category[x], hireCharge[x]);
txtVideoDetails.Text = txtVideoDetails.Text + s;
}
}

private void btnClear_Click(object sender, EventArgs e)
{
txtVideoDetails.Clear();
}

private void btnFirst_Click(object sender, EventArgs e)
{
btnFirst.Enabled = false;
btnNext.Enabled = true;
btnPrevious.Enabled = false;
btnLast.Enabled = true;

index = 0;

lblVideoNo.Text = videoNo[index].ToString();
lblTitle.Text = title[index];
lblCategory.Text = category[index];
lblHireCharge.Text = hireCharge[index].ToString();

}

private void btnNext_Click(object sender, EventArgs e)
{
btnFirst.Enabled = false;
btnNext.Enabled = true;
btnPrevious.Enabled = true;
btnLast.Enabled = true;

index++;

lblVideoNo.Text = videoNo[index].ToString();
lblTitle.Text = title[index];
lblCategory.Text = category[index];
lblHireCharge.Text = hireCharge[index].ToString();

if (index == size - 1)
{
btnNext.Enabled = false;
btnLast.Enabled = false;
}
}

private void btnPrevious_Click(object sender, EventArgs e)
{
btnFirst.Enabled = false;
btnNext.Enabled = true;
btnPrevious.Enabled = true;
btnLast.Enabled = true;

index--;

lblVideoNo.Text = videoNo[index].ToString();
lblTitle.Text = title[index];
lblCategory.Text = category[index];
lblHireCharge.Text = hireCharge[index].ToString();

if (index == 0)
{
btnPrevious.Enabled = false;
}

}

private void btnLast_Click(object sender, EventArgs e)
{
btnFirst.Enabled = true;
btnNext.Enabled = false;
btnPrevious.Enabled = true;
btnLast.Enabled = false;

index = size - 1;


lblVideoNo.Text = videoNo[index].ToString();
lblTitle.Text = title[index];
lblCategory.Text = category[index];
lblHireCharge.Text = hireCharge[index].ToString();

}

private void label6_Click(object sender, EventArgs e)
{

}

private void btnAdd_Click(object sender, EventArgs e)
{


// validation of the staff id

Boolean ok = true;
int no;

if (String.IsNullOrEmpty(txtVideoNo.Text))
{
ok = false;
errP.SetError(txtVideoNo, "Must Enter Staff ID: ");
}
else
{
try
{
no = int.Parse(txtVideoNo.Text);
if (no < 1 || no > 96)
{
ok = false;
errP.SetError(txtVideoNo, "Staff ID must be between 1 and 96");
}
else
errP.SetError(txtVideoNo, "");

}
catch (Exception ex)
{
ok = false;
errP.SetError(txtVideoNo, "Staff ID is Not Numeric");
}
}



//validation of the staff name

if (String.IsNullOrEmpty(txtTitle.Text))
{
ok = false;
errP.SetError(txtTitle, "Must Enter Staff Name: ");
}





//validation of the category selection

if (lstCategory.SelectedIndex < 0)
{
ok = false;
errP.SetError(lstCategory, "Must Select a Category");
}
else
errP.SetError(lstCategory, "");

if (ok == true)
{
videoNo[size] = int.Parse(txtVideoNo.Text);
category[size] = lstCategory.SelectedItem.ToString();
title[size] = txtTitle.Text;
hireCharge[size] = int.Parse(txtHireCharge.Text);



//Array
size++;

txtVideoNo.Clear();
lstCategory.ClearSelected();
txtTitle.Clear();
txtHireCharge.Clear();

txtVideoNo.Focus();

}


//salary validation

if (String.IsNullOrEmpty(txtHireCharge.Text))
{
ok = false;
errP.SetError(txtHireCharge, "Must Enter Salary: ");
}
else
{
try
{
no = int.Parse(txtHireCharge.Text);
if (no < 0)
{
ok = false;
errP.SetError(txtHireCharge, "Salary must be greater than 0");
}
else
errP.SetError(txtHireCharge, "");

}
catch (Exception ex)
{
ok = false;
errP.SetError(txtHireCharge, "Salary is Not Numeric");
}
}



















//set of if statements which displays a messagebox if input is not entered into all textboxes











}

private void btnFind_Click(object sender, EventArgs e)
{
int no;
bool ok = false;
int x;


no = int.Parse(txtSearchVideoNo.Text);

for (x = 0; x < size; x++)
{
if (no == videoNo[x])
{
ok = true;
txtSrVideoTitle.Text = title[x];
textCampus.Text = category[x];
txtSrHireCharge.Text = hireCharge[x].ToString();

panVideoDetails.Visible = true;
}
}

if (ok == false)
{
panVideoDetails.Visible = false;
MessageBox.Show("Invalid Video No", "Video Details", MessageBoxButtons.OK);
}




}

private void btnClear2_Click(object sender, EventArgs e)
{
txtSearchVideoNo.Clear();
txtSrVideoTitle.Clear();
textCampus.Clear();
txtSrHireCharge.Clear();

}

private void txtVideoDetails_TextChanged(object sender, EventArgs e)
{

}

private void txtVideoNo_TextChanged(object sender, EventArgs e)
{



//videoNo[size] = int.Parse(txtVideoNo.Text);




}

private void btnAdd_KeyPress(object sender, KeyPressEventArgs e)
{

}


private void txtVideoNo_KeyPress(object sender, KeyPressEventArgs e)
{



txtVideoNo.MaxLength = 4;







//code to ensure that only numeric data is allowed to be entered into the textbox by the user
if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.') { e.Handled = true; }













}

private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{

}

private void tabPage3_Click(object sender, EventArgs e)
{

}

private void txtTitle_TextChanged(object sender, EventArgs e)
{
//code to ensure that the textbox max length is set to 24 characters
txtTitle.MaxLength = 24;


}

private void txtHireCharge_TextChanged(object sender, EventArgs e)
{
//code to ensure that the textbox max length is set to 6
txtHireCharge.MaxLength = 6;

}

private void pictureBox1_Click(object sender, EventArgs e)
{




}

private void menuStrip1_ItemClicked_1(object sender, ToolStripItemClickedEventArgs e)
{

}

private void toolStripMenuItem1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2.Show();
this.Hide();
}

private void backToLoginScreenToolStripMenuItem_Click(object sender, EventArgs e)
{

}



}
}

how could i do this?.