void BtnNewMakeClick(object sender, System.EventArgs e)
{
	NewMake frmNewMake = new NewMake();
	frmNewMake.ShowDialog();
}

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 4/9/2005
 * Time: 7:20 AM
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Xml;

void NewPartLoad(object sender, System.EventArgs e)
{
	// Fill the Year combo box with years from 1960 to the coming year
	for(int i = DateTime.Now.Year+1; i >= 1960; i--)
		this.cboYears.Items.Add(i.ToString());

	// We will generate a random number for the item
	// To start, we will use the miliseconds as a seed
	DateTime tmeNow = DateTime.Now;
	int ms = tmeNow.Millisecond;

	// Now we can generate a random number between 100000 and 999999
	Random rndNumber = new Random(ms);

	// Generate three randomg characters
	Char firstCharacter  = (Char)(rndNumber.Next(65, 90));
		Char secondCharacter = (Char)(rndNumber.Next(65, 90));
	Char thirdCharacter  = (Char)(rndNumber.Next(65, 90));
	// Generate a random number made of 4 digits
	int numberPart = rndNumber.Next(1000, 9999);
	 
	// Exclude the digits 1 and 0 because they create confusion
	if( firstCharacter == 'I' || firstCharacter == 'O' )
		firstCharacter = 'A';
	if( secondCharacter == 'I' || secondCharacter == 'O' )
		secondCharacter = 'A';
	if( thirdCharacter == 'I' || thirdCharacter == 'O' )
		thirdCharacter = 'A';
	// Generate a random number between 1 and 3
	int rndCombination = rndNumber.Next(1, 4);
	string strPartNumber = null;

	// Create a part number using some algorithm
	if( rndCombination == 1 )
		strPartNumber = firstCharacter.ToString() + secondCharacter.ToString() +
			numberPart.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 2 )
		strPartNumber = firstCharacter.ToString() + numberPart.ToString() +
			secondCharacter.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 3 )
		strPartNumber = numberPart.ToString() + firstCharacter.ToString() +
			secondCharacter.ToString() + thirdCharacter.ToString();
	else
		strPartNumber = rndNumber.Next(100000, 999999).ToString();

	// Display the new number in the Part # text box
	this.txtPartNumber.Text = strPartNumber;

	// Disable the OK button to indicate that the part is not ready
	this.btnAddPart.Enabled = false;
}

void BtnNewMakeClick(object sender, System.EventArgs e)
{
	NewMake frmMake = new NewMake();
	frmMake.ShowDialog();
}

void BtnNewModelClick(object sender, System.EventArgs e)
{
	NewModel frmModel = new NewModel();
	frmModel.ShowDialog();
}

void BtnNewCategoryClick(object sender, System.EventArgs e)
{
	NewCategory frmCat = new NewCategory();
	frmCat.ShowDialog();
}

void BtnCloseClick(object sender, System.EventArgs e)
{
	Close();
}

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 4/9/2005
 * Time: 9:04 AM
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Xml;

private void OrderProcessingLoad(object sender, System.EventArgs e)
{
	// Fill the Year combo box with years from 1960 to the coming year
	for(int i = DateTime.Now.Year+1; i >= 1960; i--)
		this.cboYears.Items.Add(i.ToString());
}

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 4/9/2005
 * Time: 9:04 AM
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */

using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Xml;

private void BtnNewPartClick(object sender, System.EventArgs e)
{
	NewPart frmPart = new NewPart();

	frmPart.ShowDialog();
}

private void BtnCloseClick(object sender, System.EventArgs e)
{
	Close();
}

private void BtnOrderProcessingClick(object sender, System.EventArgs e)
{
	OrderProcessing frmOrder = new OrderProcessing();

	frmOrder.ShowDialog();
}

private void BtnNewPartClick(object sender, System.EventArgs e)
{
	NewPart frmPart = new NewPart();

	frmPart.ShowDialog();
}

private void BtnCloseClick(object sender, System.EventArgs e)
{
	Close();
}

private void NewModelLoad(object sender, System.EventArgs e)
{
	// We will need a reference to the XML document
	XmlDocument docXML = new XmlDocument();

	// We will start with the Make combo box
	// Open the Cars.xml file
	docXML.Load("Cars.xml");
	// Get a reference to the root node
	XmlElement nodRoot = docXML.DocumentElement;
	// Locate all nodes whose name is Make
	XmlNodeList nodItems = nodRoot.GetElementsByTagName("Make");
	// Retrieve the value of each Make node and put 
	// that value in the Make combo box
	for(int i = 0; i < nodItems.Count; i++)
		this.cboMakes.Items.Add(nodItems[i].Attributes["MakeName"].InnerText);
}

private void NewPartLoad(object sender, System.EventArgs e)
{
	// Fill the Year combo box with years from 1960 to the coming year
	for(int i = DateTime.Now.Year+1; i >= 1960; i--)
		this.cboYears.Items.Add(i.ToString());

	// We will need a reference to the XML document
	XmlDocument docXML = new XmlDocument();

	// Open the Cars.xml file
	docXML.Load("Cars.xml");

	// Get a reference to the root node
	XmlElement nodRoot = docXML.DocumentElement;
	// Locate all nodes whose name is Make
	XmlNodeList nodItems = nodRoot.GetElementsByTagName("Make");
	// Retrieve the value of each Make node and put 
	// that value in the Make combo box
	for(int i = 0; i < nodItems.Count; i++)
		this.cboMakes.Items.Add(nodItems[i].Attributes["MakeName"].InnerText);

	// Open the Makes.xml file
	docXML.Load("PartCategories.xml");

	// Get a reference to the root node
	nodRoot = docXML.DocumentElement;
	// Locate all nodes whose name is Make
	nodItems = nodRoot.GetElementsByTagName("PartCategory");
	// Retrieve the value of each Make node and put 
	// that value in the Make combo box
	for(int i = 0; i < nodItems.Count; i++)
		this.cboPartCategories.Items.Add(nodItems[i].InnerText);

	this.cboPartCategories.Text = "Miscellaneous";

	// We will generate a random number for the item
	// To start, we will use the miliseconds as a seed
	DateTime tmeNow = DateTime.Now;
	int ms = tmeNow.Millisecond;

	// Now we can generate a random number between 100000 and 999999
	Random rndNumber = new Random(ms);

	// Generate three randomg characters
	Char firstCharacter  = (Char)(rndNumber.Next(65, 90));
	Char secondCharacter = (Char)(rndNumber.Next(65, 90));
	Char thirdCharacter  = (Char)(rndNumber.Next(65, 90));
	// Generate a random number made of 4 digits
	int numberPart = rndNumber.Next(1000, 9999);
	 
	// Exclude the digits 1 and 0 because they create confusion
	if( firstCharacter == 'I' || firstCharacter == 'O' )
		firstCharacter = 'A';
	if( secondCharacter == 'I' || secondCharacter == 'O' )
		secondCharacter = 'A';
	if( thirdCharacter == 'I' || thirdCharacter == 'O' )
		thirdCharacter = 'A';
	// Generate a random number between 1 and 3
	int rndCombination = rndNumber.Next(1, 4);
	string strPartNumber = null;

	// Create a part number using some algorithm
	if( rndCombination == 1 )
		strPartNumber = firstCharacter.ToString() + secondCharacter.ToString() +
			numberPart.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 2 )
		strPartNumber = firstCharacter.ToString() + numberPart.ToString() +
			secondCharacter.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 3 )
		strPartNumber = numberPart.ToString() + firstCharacter.ToString() +
			secondCharacter.ToString() + thirdCharacter.ToString();
	else
		strPartNumber = rndNumber.Next(100000, 999999).ToString();

	// Display the new number in the Part # text box
	this.txtPartNumber.Text = strPartNumber;

	// Disable the OK button to indicate that the part is not ready
	this.btnAddPart.Enabled = false;
}

private void BtnNewMakeClick(object sender, System.EventArgs e)
{
	// The new car make will come from the New Make dialog box
	 NewMake frmMake = new NewMake();

	 // Display the New Make dialog box and find out if the user clicked OK
	 if( frmMake.ShowDialog() == DialogResult.OK )
	 {
		 string strNewMake = frmMake.txtNewMake.Text;

		 // If the user didn't create a new Make, don't do anything
		 if( strNewMake == "" )
			 return;

		 // Before adding the new make, check that it doesn't exist already
		 if( this.cboMakes.FindStringExact(strNewMake) > 0 )
			 return;

		 // Now you can add it
		 this.cboMakes.Items.Add(strNewMake);
		 // The user likely wants this new item selected
		 this.cboMakes.Text = strNewMake;

		 // Open the Cars.xml file
		 XmlDocument docXMLFile = new XmlDocument();
		 docXMLFile.Load("Cars.xml");

		 // Get the root node so we can explore its children
		 XmlNode nodRoot = docXMLFile.DocumentElement;
		 
		 // If the car is not in the list already, create its Make node
		 XmlNode nodNewMake  = docXMLFile.CreateNode(XmlNodeType.Element, "Make", "");
		 // Create an attribute for the node
		 ((XmlElement)(nodNewMake)).SetAttribute("MakeName", strNewMake);
		 
		 // Add the new node to the XML file
		 docXMLFile.DocumentElement.AppendChild(nodNewMake);
		 
		 // Save the file
		 docXMLFile.Save("Cars.xml");
	}
}

private void BtnNewMakeClick(object sender, System.EventArgs e)
{
	// The new car make will come from the New Make dialog box
	 NewMake frmMake = new NewMake();

	 // Display the New Make dialog box and find out if the user clicked OK
	 if( frmMake.ShowDialog() == DialogResult.OK )
	 {
		 string strNewMake = frmMake.txtNewMake.Text;

		 // If the user didn't create a new Make, don't do anything
		 if( strNewMake == "" )
			 return;

		 // Before adding the new make, check that it doesn't exist already
		 if( this.cboMakes.FindStringExact(strNewMake) > 0 )
			 return;

		 // Now you can add it
		 this.cboMakes.Items.Add(strNewMake);
		 // The user likely wants this new item selected
		 this.cboMakes.Text = strNewMake;

		 // Open the Cars.xml file
		 XmlDocument docXMLFile = new XmlDocument();
		 docXMLFile.Load("Cars.xml");

		 // Get the root node so we can explore its children
		 XmlNode nodRoot = docXMLFile.DocumentElement;
		 
		 // If the car is not in the list already, create its Make node
		 XmlNode nodNewMake  = docXMLFile.CreateNode(XmlNodeType.Element, "Make", "");
		 // Create an attribute for the node
		 ((XmlElement)(nodNewMake)).SetAttribute("MakeName", strNewMake);
		 
		 // Add the new node to the XML file
		 docXMLFile.DocumentElement.AppendChild(nodNewMake);
		 
		 // Save the file
		 docXMLFile.Save("Cars.xml");
	}
}

private void BtnNewModelClick(object sender, System.EventArgs e)
{
	// The new car model will come from the New Model dialog box
	 NewModel frmModel = new NewModel();

	 // Display the New Model dialog box and find out if the user clicked OK
	 if( frmModel.ShowDialog() == DialogResult.OK )
	 {
		 // Retrieve the values that the user specified
		 string strMake     = frmModel.cboMakes.Text;
		 string strNewModel = frmModel.txtNewModel.Text;

		 // If the new didn't select a Make, don't do anything
		 if( strMake.Equals("") )
			 return;
		 // If the New Model string is empty, don't do anything
		 if( strNewModel.Equals("") )
			 return;

		 // Open the Cars.xml file
		 XmlDocument docXMLFile = new XmlDocument();
		 docXMLFile.Load("Cars.xml");

		 // Get the root node so we can explore its children
		 XmlNode nodRoot = docXMLFile.DocumentElement;
		 
		 // Create a list of all Make nodes
		 XmlNodeList lstMakes = docXMLFile.GetElementsByTagName("Make");

		 // Visit each Make
		 for(int i = 0; i < lstMakes.Count; i++)
		 {
			 // Get a reference to the current node
			 XmlNode curMake = lstMakes[i];

			 // If, or when you find the Make
			 if( curMake.Attributes["MakeName"].InnerText.Equals(strMake) )
			 {
				 // Since we found the Make, find out if the model exists
				 XmlNodeList lstCurrentModels = curMake.ChildNodes;

				 // Check each model if the list already contains the model
				 for(int j = 0; j < lstCurrentModels.Count; j++)
				 {
					 if( lstCurrentModels[j].InnerText.Equals(strNewModel) )
					 {
					MessageBox.Show("That model exists already in the database");
						 return;
					 }
				 }

				 // create a child node to it
			    XmlNode nodModel = docXMLFile.CreateNode(XmlNodeType.Element, "Model", "");
				 // Create its value using the string from the New Make dialog box
				 nodModel.InnerText = strNewModel;
				 // Add the new element at the end of the file
				 curMake.AppendChild(nodModel);

				 // Save the file
				 docXMLFile.Save("Cars.xml");
				 break;
			 }
		 }
	}
}

private void CboMakesSelectedIndexChanged(object sender, System.EventArgs e)
{
	// Empty the Models combo box
	this.cboModels.Items.Clear();

	// Find out if the user had selected a Make
	string strSelectedMake = this.cboMakes.Text;
	// Open the Cars.xml file
	XmlDocument docXML = new XmlDocument();
	docXML.Load("Cars.xml");

	// Get a reference to the root node
	XmlElement nodRoot = docXML.DocumentElement;
	// Locate all nodes whose name is Make
	XmlNodeList nodMakes = nodRoot.GetElementsByTagName("Make");
	// Look for the Make that is the same the user selected
	for(int i = 0; i < nodMakes.Count; i++)
	{
		// Retrieve the value of each Make node and put
		string strMakeName = nodMakes[i].Attributes["MakeName"].InnerText;
		// If you find it...
		if( strMakeName.Equals(strSelectedMake) )
		{
			// If you find it, make a list of its models...
			XmlNodeList nodAvailableModels = nodMakes[i].ChildNodes;
			// ... then add each of its models to the Model combo box
			for(int j = 0; j < nodAvailableModels.Count; j++)
				this.cboModels.Items.Add(nodAvailableModels[j].InnerText);
		}
	}
}

private void BtnNewCategoryClick(object sender, System.EventArgs e)
{
	// Get a reference to the New Part Category form
	 NewPartCategory frmCategory = new NewPartCategory();

	 // Display the New Part Category dialog box and find out if the user clicked OK
	 if( frmCategory.ShowDialog() == DialogResult.OK )
	 {
		 string strCategory = frmCategory.txtNewCategory.Text;

		 // If the user didn't create a new category, don't do anything
		 if( strCategory.Equals("") )
			 return;

		 // Before adding the new category, check that it doesn't exist already
		 if( this.cboPartCategories.FindStringExact(strCategory) > 0 )
			 return;

		 // Now you can add it
		 this.cboPartCategories.Items.Add(strCategory);
		 // The user likely wants this new item selected
		 this.cboPartCategories.Text = strCategory;

		 // Open the PartCategories.xml file
		 XmlDocument docXMLFile = new XmlDocument();
		 docXMLFile.Load("PartCategories.xml");

		 // Get the root node so we can explore its children
		 XmlNode nodRoot = docXMLFile.DocumentElement;
		 
		 // If the new part is not in the list already, create its node
	XmlNode nodNewCategory  = docXMLFile.CreateNode(XmlNodeType.Element, "PartCategory", "");
		 // Create text for the node
		 nodNewCategory.InnerText = strCategory;
		 
		 // Add the new node to the XML file
		 docXMLFile.DocumentElement.AppendChild(nodNewCategory);
		 
		 // Save the file
		 docXMLFile.Save("PartCategories.xml");
	}
}

private void TxtPartNameTextChanged(object sender, System.EventArgs e)
{
	// If there is no part name, no need to add the item to the XML file
	if( this.txtPartName.Text == "" )
		this.btnAddPart.Enabled = false;
	else
		this.btnAddPart.Enabled = true;
}

private void TxtUnitPriceTextChanged(object sender, System.EventArgs e)
{
	// If the price is not specified, don't add the item to the XML file
	if( this.txtUnitPrice.Text == "" )
		this.btnAddPart.Enabled = false;
	else
		this.btnAddPart.Enabled = true;
}

private void TxtPartNumberTextChanged(object sender, System.EventArgs e)
{
	// Make sure that there is a Part Number for this item
	// Otherwise, don't add the part to the XML file
	if( this.txtPartNumber.Text == "" )
		this.btnAddPart.Enabled = false;
	else
		this.btnAddPart.Enabled = true;
}

private void BtnAddPartClick(object sender, System.EventArgs e)
{
	// Open the Parts.xml file
	XmlDocument docXML = new XmlDocument();
	docXML.Load("Parts.xml");

	// Before adding the new part, make sure all components are ready
	// Otherwise, don't add it
	if( this.cboYears.SelectedIndex < 0 )
	{
		MessageBox.Show("You must specify the year. " +
			"This will help to locate the part");
		this.cboYears.Focus();
		return;
	}
	if( this.cboMakes.SelectedIndex < 0 )
	{
		MessageBox.Show("Please select the car make for this part.");
		this.cboMakes.Focus();
		return;
	}
	if( this.cboModels.SelectedIndex < 0 )
	{
		MessageBox.Show("The car model is required. " +
			"It helps to know the specific car this part is made for.");
		this.cboModels.Focus();
		return;
	}
	if( this.txtPartName.Text.Equals("") )
	{
		MessageBox.Show("You must specify the part name or a (very) short description.");
		this.txtPartName.Focus();
		return;
	}
	if( this.txtUnitPrice.Text.Equals("") )
	{
		MessageBox.Show("You must enter the price of each unit of this part.");
		this.txtUnitPrice.Focus();
		return;
	}
	if( this.txtPartNumber.Text.Equals("") )
	{
		MessageBox.Show("Every item of this database must have a number. " +
			"The number is just a combination of letters and digits." +
			"Please make up a number and enter it in the Part # box.");
		this.txtPartNumber.Focus();
		return;
	}

	// The part seems to be ready
	// Get a reference to the root node
	XmlElement nodNewPart = docXML.CreateElement("Part");
	// Create a new part as a child of the root (this is a simple node addition
	string strNewPart = "<PartNumber>", this.txtPartNumber.Text, "</PartNumber>" +
				"<CarYear>", this.cboYears.Text, "</CarYear>" +
				"<Make>", this.cboMakes.Text, "</Make>" +
				"<Model>", this.cboModels.Text, "</Model>" +
				"<PartName Category=\"", this.cboPartCategories.Text,"\">" +
				this.txtPartName.Text, "</PartName>" +
				"<UnitPrice>", this.txtUnitPrice.Text, "</UnitPrice>");
	nodNewPart.InnerXml = strNewPart;
	docXML.DocumentElement.AppendChild(nodNewPart);
	docXML.Save("Parts.xml");

	// Reset the form in case the user wants to add another part
	this.cboYears.SelectedIndex = -1;
	this.cboMakes.SelectedIndex = -1;
	this.cboModels.SelectedIndex = -1;
	this.cboPartCategories.Text = "Miscellaneou";
	this.txtPartName.Text = "";
	this.txtUnitPrice.Text = "";
	 
	// We will generate a random number for the item
	// To start, we will use the miliseconds as a seed
	DateTime tmeNow = DateTime.Now;
	int ms = tmeNow.Millisecond;

	// Now we can generate a random number between 100000 and 999999
	Random rndNumber = new Random(ms);

	// Generate three randomg characters
	Char firstCharacter  = (Char)(rndNumber.Next(65, 90));
	Char secondCharacter = (Char)(rndNumber.Next(65, 90));
	Char thirdCharacter  = (Char)(rndNumber.Next(65, 90));
	// Generate a random number made of 4 digits
	int numberPart = rndNumber.Next(1000, 9999);
	 
	// Exclude the digits 1 and 0 because they create confusion
	if( firstCharacter == 'I' || firstCharacter == 'O' )
		firstCharacter = 'A';
	if( secondCharacter == 'I' || secondCharacter == 'O' )
		secondCharacter = 'A';
	if( thirdCharacter == 'I' || thirdCharacter == 'O' )
		thirdCharacter = 'A';
	// Generate a random number between 1 and 3
	int rndCombination = rndNumber.Next(1, 4);
	string strPartNumber = null;

	// Create a part number using some algorithm
	if( rndCombination == 1 )
		strPartNumber = firstCharacter.ToString() + secondCharacter.ToString() +
			numberPart.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 2 )
		strPartNumber = firstCharacter.ToString() + numberPart.ToString() + 
			secondCharacter.ToString() + thirdCharacter.ToString();
	else if( rndCombination == 3 )
		strPartNumber = numberPart.ToString() + firstCharacter.ToString() +
			secondCharacter.ToString() + thirdCharacter.ToString();
	else
		strPartNumber = rndNumber.Next(100000, 999999).ToString();

	// Display the new number in the Part # text box
	this.txtPartNumber.Text = strPartNumber;
	this.cboYears.Focus();
}