Hello there,
Basically I was asked to produce an application that is able to save customer info into a database however, my college's computers do not support connections with Microsoft Access, SQL or MySQL. Thus, I decided to convert my application to using a textfile as a database. I know this seems like a drag but it is something I must do to get a grade on my assignment. What my application does is, shows a login form that reads username and password from database and when it logs in it allows the user to save customer information, delete customer information and update customer information from the database. I was wondering if I can do the same with a textfile database. Thank you in advance. Here's all of my code.
Form 1:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Globalization;
namespace phoney_warehouse
{
public partial class Form1 : Form
{
private OleDbConnection connection = new OleDbConnection();
public Form1()
{
InitializeComponent();
connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:/customers.accdb;Jet OLEDB:Database Password=";
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
connection.Open();
label6.Text = "Database status: Successfuly connected";
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
}
private void login_Enter(object sender, EventArgs e)
{
}
private void btn_login_Click(object sender, EventArgs e)
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "select * from login where username='"+txt_Username.Text+"' and Password='"+txt_Password.Text+"'";
OleDbDataReader reader = command.ExecuteReader();
int count = 0;
while (reader.Read())
{
count = count + 1;
}
if(count == 1)
{
MessageBox.Show("Username and Password are correct");
connection.Close();
connection.Dispose();
this.Hide();
Form2 f2 = new Form2();
f2.ShowDialog();
}
else if (count > 1)
{
MessageBox.Show("Duplicate Username and Password are correct");
}
else
{
MessageBox.Show("Username or Password is incorrect");
}
connection.Close();
}
}
}
Form 2:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;
using System.Windows.Forms.VisualStyles;
using System.Drawing.Printing;
namespace phoney_warehouse
{
public partial class Form2 : Form
{
private OleDbConnection connection = new OleDbConnection();
public Form2()
{
InitializeComponent();
connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:/customers.accdb;Jet OLEDB:Database Password=";
document.PrintPage += new PrintPageEventHandler(document_PrintPage);
}
string payasyougo;
string saver;
string regular;
double fee = 0;
double? finalfee;
private double? payg;
PrintDocument document = new PrintDocument();
PrintDialog dialog = new PrintDialog();
Customer code1 = new Customer();
Customer name1 = new Customer();
Customer number1 = new Customer();
Customer address1 = new Customer();
Account usage1 = new Account();
private void log_out_Click(object sender, EventArgs e)
{
this.Hide();
Form1 f2 = new Form1();
f2.ShowDialog();
}
private void Form2_Load(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "select * from customers";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
comboBox1.Items.Add(reader["CustomerName"].ToString());
}
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
connection.Close();
}
private void add_customer_Click(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command = new OleDbCommand("INSERT INTO customers ([CustomerCode], [CustomerName], [PhoneNumber], [Address], [Usage], [CustomerID]) VALUES (@CustomerCode,@CustomerName,@PhoneNumber,@Address,@Usage,@CustomerID)", connection);
command.Parameters.AddWithValue("@CustomerCode", customer_code.Text);
command.Parameters.AddWithValue("@CustomerName", customer_name.Text);
command.Parameters.AddWithValue("@PhoneNumber", address.Text);
command.Parameters.AddWithValue("@Address", phone_number.Text);
command.Parameters.AddWithValue("@Usage", usage.Text);
command.Parameters.AddWithValue("@CustomerID", customer_ID.Text);
command.ExecuteNonQuery();
MessageBox.Show("Data saved successfuly!");
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
connection.Close();
Customer code1 = new Customer();
code1.CustomerCode = customer_code.Text;
Customer name1 = new Customer();
name1.Name = customer_name.Text;
Customer number1 = new Customer();
number1.PhoneNumber = phone_number.Text;
Customer address1 = new Customer();
address1.Address = address.Text;
Account usage1 = new Account();
Account fee1 = new Account();
fee1.AccountFees = 0;
usage1.AccountUsage = Convert.ToInt32(usage.Text);
PayAsYouGoAccount payga1 = new PayAsYouGoAccount();
payga1.AccountCost = payga1.AccountCost;
Saver saver1 = new Saver();
saver1.AccountFees = saver1.AccountFees;
saver1.AccountUsage = saver1.AccountUsage;
saver1.AccountCost = saver1.AccountCost;
Regular regular1 = new Regular();
regular1.AccountFees = regular1.AccountFees;
regular1.AccountUsage = regular1.AccountUsage;
regular1.AccountCost = regular1.AccountCost;
if (radioButton1.Checked == true)
{
payasyougo = "Pay As You Go";
payg = payga1.AccountCost * usage1.AccountUsage;
}
else if (radioButton1.Checked == false)
{
payasyougo = "";
payg = null;
}
if (radioButton2.Checked == true)
{
saver = "Saver";
fee = usage1.AccountUsage - saver1.AccountUsage;
if (fee < 0)
{
finalfee = saver1.AccountFees;
}
else
{
finalfee = (fee * saver1.AccountCost) + saver1.AccountFees;
}
}
else if (radioButton2.Checked == false)
{
saver = "";
finalfee = null;
}
if (radioButton3.Checked == true)
{
regular = "Regular";
fee = usage1.AccountUsage - regular1.AccountUsage;
if (fee < 0)
{
finalfee = regular1.AccountFees;
}
else
{
finalfee = (fee * regular1.AccountCost) + regular1.AccountFees;
}
}
else if (radioButton3.Checked == false)
{
regular = "";
}
customerinfo.Text = ("Customer code: " + code1.CustomerCode
+ Environment.NewLine + "Customer name: " + name1.Name
+ Environment.NewLine + "Phone number: " + number1.PhoneNumber
+ Environment.NewLine + "Customer address:" + address1.Address
+ Environment.NewLine + "Customer account: " + payasyougo + saver + regular
+ Environment.NewLine + "Current month usage: " + usage1.AccountUsage + " minutes"
+ Environment.NewLine + "Current month cost: £ " + finalfee + payg);
}
private void phone_number_KeyPress_1(object sender, KeyPressEventArgs e)
{
e.Handled = (!char.IsDigit(e.KeyChar)) && (!char.IsControl(e.KeyChar));
}
private void usage_KeyPress_1(object sender, KeyPressEventArgs e)
{
e.Handled = (!char.IsDigit(e.KeyChar)) && (!char.IsControl(e.KeyChar));
}
private void update_customer_Click(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "update customers set [CustomerCode]='" + customer_code.Text + "' ,[CustomerName]='" + customer_name.Text + "',[Address]='" + address.Text + "',[PhoneNumber]='" + phone_number.Text + "',[Usage]='" + usage.Text + "'where CustomerID="+customer_ID.Text+"";
MessageBox.Show(query);
command.CommandText = query;
command.ExecuteNonQuery();
MessageBox.Show("Data updated successfuly!");
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
connection.Close();
}
private void remove_customer_Click(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "delete from customers where CustomerID="+customer_ID.Text+"";
MessageBox.Show(query);
command.CommandText = query;
command.ExecuteNonQuery();
MessageBox.Show("Data deleted successfuly!");
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
connection.Close();
customer_ID.Text = "";
customer_code.Text = "";
customer_name.Text = "";
address.Text = "";
phone_number.Text = "";
usage.Text = "";
}
void document_PrintPage(object sender, PrintPageEventArgs e)
{
e.Graphics.DrawString(customerinfo.Text, new Font("Arial", 20, FontStyle.Regular), Brushes.Black, 20, 20);
}
private void button1_Click(object sender, EventArgs e)
{
dialog.Document = document;
if (dialog.ShowDialog() == DialogResult.OK)
{
document.Print();
}
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "select * from customers where CustomerName='"+comboBox1.Text+"'";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
customer_code.Text = reader["CustomerCode"].ToString();
customer_name.Text = reader["CustomerName"].ToString();
address.Text = reader["Address"].ToString();
phone_number.Text = reader["PhoneNumber"].ToString();
usage.Text = reader["Usage"].ToString();
customer_ID.Text = reader["CustomerID"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
Customer code1 = new Customer();
code1.CustomerCode = customer_code.Text;
Customer name1 = new Customer();
name1.Name = customer_name.Text;
Customer number1 = new Customer();
number1.PhoneNumber = phone_number.Text;
Customer address1 = new Customer();
address1.Address = address.Text;
Account usage1 = new Account();
Account fee1 = new Account();
fee1.AccountFees = 0;
usage1.AccountUsage = Convert.ToInt32(usage.Text);
PayAsYouGoAccount payga1 = new PayAsYouGoAccount();
payga1.AccountCost = payga1.AccountCost;
Saver saver1 = new Saver();
saver1.AccountFees = saver1.AccountFees;
saver1.AccountUsage = saver1.AccountUsage;
saver1.AccountCost = saver1.AccountCost;
Regular regular1 = new Regular();
regular1.AccountFees = regular1.AccountFees;
regular1.AccountUsage = regular1.AccountUsage;
regular1.AccountCost = regular1.AccountCost;
if (radioButton1.Checked == true)
{
payasyougo = "Pay As You Go";
payg = payga1.AccountCost * usage1.AccountUsage;
}
else if (radioButton1.Checked == false)
{
payasyougo = "";
payg = null;
}
if (radioButton2.Checked == true)
{
saver = "Saver";
fee = usage1.AccountUsage - saver1.AccountUsage;
if (fee < 0)
{
finalfee = saver1.AccountFees;
}
else
{
finalfee = (fee * saver1.AccountCost) + saver1.AccountFees;
}
}
else if (radioButton2.Checked == false)
{
saver = "";
finalfee = null;
}
if (radioButton3.Checked == true)
{
regular = "Regular";
fee = usage1.AccountUsage - regular1.AccountUsage;
if (fee < 0)
{
finalfee = regular1.AccountFees;
}
else
{
finalfee = (fee * regular1.AccountCost) + regular1.AccountFees;
}
}
else if (radioButton3.Checked == false)
{
regular = "";
}
customerinfo.Text = ("Customer code: " + code1.CustomerCode
+ Environment.NewLine + "Customer name: " + name1.Name
+ Environment.NewLine + "Phone number: " + number1.PhoneNumber
+ Environment.NewLine + "Customer address:" + address1.Address
+ Environment.NewLine + "Customer account: " + payasyougo + saver + regular
+ Environment.NewLine + "Current month usage: " + usage1.AccountUsage + " minutes"
+ Environment.NewLine + "Current month cost: £ " + finalfee + payg);
}
}
}
Submit an article or tip