Loan Amortization Application in WPF using VC++

#include "MainWindow.h"
#include "PaymentWindow.h"

MainWindow::MainWindow()
{
	Title = L"Amortization";
	Height = 300;
	Width = 400;
	WindowStyle = Windows::WindowStyle::ToolWindow;
	ResizeMode = Windows::ResizeMode::NoResize;
	WindowStartupLocation = Windows::WindowStartupLocation::CenterScreen;
	
	Grid^ grid = gcnew Grid();

	grid->Background::set(Media::Brushes::Khaki);

	// Create Rows in grid layout
	Windows::Controls::RowDefinition^ row1 = gcnew Windows::Controls::RowDefinition();
	Windows::Controls::RowDefinition^ row2 = gcnew Windows::Controls::RowDefinition();
	Windows::Controls::RowDefinition^ row3 = gcnew Windows::Controls::RowDefinition();
	Windows::Controls::RowDefinition^ row4 = gcnew Windows::Controls::RowDefinition();
	Windows::Controls::RowDefinition^ row5 = gcnew Windows::Controls::RowDefinition();

	// Create Columns in grid layout
	Windows::Controls::ColumnDefinition^ col1 = gcnew Windows::Controls::ColumnDefinition();
	Windows::Controls::ColumnDefinition^ col2 = gcnew Windows::Controls::ColumnDefinition();

	// Add all the rows into grid
	grid->RowDefinitions->Add(row1);
	grid->RowDefinitions->Add(row2);
	grid->RowDefinitions->Add(row3);
	grid->RowDefinitions->Add(row4);
	grid->RowDefinitions->Add(row5);

	// Add all the columns into grid
	grid->ColumnDefinitions->Add(col1);
	grid->ColumnDefinitions->Add(col2);

	// Principle Label
	lblPrinciple = gcnew Label();
	lblPrinciple->Margin = Thickness(5);
	lblPrinciple->Content = L"Principle Amount";
	lblPrinciple->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(lblPrinciple, 0);
	grid->SetColumn(lblPrinciple, 0);

	// Principle text
	txtPrinciple = gcnew TextBox();
	txtPrinciple->Margin = Thickness(5);
	txtPrinciple->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(txtPrinciple, 0);
	grid->SetColumn(txtPrinciple, 1);

	// Interest Label
	lblInterest = gcnew Label();
	lblInterest->Margin = Thickness(5);
	lblInterest->Content = L"Interest Rate";
	lblInterest->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(lblInterest, 1);
	grid->SetColumn(lblInterest, 0);

	// Interest Rate text
	txtInterest = gcnew TextBox();
	txtInterest->Margin = Thickness(5);
	txtInterest->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(txtInterest, 1);
	grid->SetColumn(txtInterest, 1);

	// No of Years Label
	lblYears = gcnew Label();
	lblYears->Margin = Thickness(10);
	lblYears->Content = L"No of Years";
	lblYears->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(lblYears, 2);
	grid->SetColumn(lblYears, 0);

	// No of Years text
	txtYears = gcnew TextBox();
	txtYears->Margin = Thickness(5);
	txtYears->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(txtYears, 2);
	grid->SetColumn(txtYears, 1);

	// Payment Method Label
	lblPaymentMethod = gcnew Label();
	lblPaymentMethod->Margin = Thickness(5);
	lblPaymentMethod->Content = L"Payment Method";
	lblPaymentMethod->VerticalAlignment = Windows::VerticalAlignment::Center;
	grid->SetRow(lblPaymentMethod, 3);
	grid->SetColumn(lblPaymentMethod, 0);

	// Payment Method Combo Box
	cmbPaymentMethod = gcnew ComboBox();
	cmbPaymentMethod->Margin = Thickness(5, 15, 5, 15);
	cmbPaymentMethod->SelectionChanged += gcnew SelectionChangedEventHandler(this, &MainWindow::OnSelectionChange);
	grid->SetRow(cmbPaymentMethod, 3);
	grid->SetColumn(cmbPaymentMethod, 1);

	// Payment Button
	btnPayment = gcnew Button();
	btnPayment->Margin = Thickness(25, 10, 25, 10);
	btnPayment->Content = L"Payment";
	btnPayment->Click += gcnew RoutedEventHandler(this, &MainWindow::OnBtnPayment);
	grid->SetRow(btnPayment, 4);
	grid->SetColumn(btnPayment, 0);

	// Exit Button
	btnExit = gcnew Button();
	btnExit->Margin = Thickness(25, 10, 25, 10);
	btnExit->Content = L"Exit";
	btnExit->Click += gcnew RoutedEventHandler(this, &MainWindow::OnBtnExit);
	grid->SetRow(btnExit, 4);
	grid->SetColumn(btnExit, 1);

	// Add childern into grid layout
	grid->Children->Add(lblPrinciple);
	grid->Children->Add(txtPrinciple);
	grid->Children->Add(lblInterest);
	grid->Children->Add(txtInterest);
	grid->Children->Add(lblYears);
	grid->Children->Add(txtYears);
	grid->Children->Add(lblPaymentMethod);
	grid->Children->Add(cmbPaymentMethod);
	grid->Children->Add(btnPayment);
	grid->Children->Add(btnExit);
	Content = grid;

	// Fill the combo box with default values
	cmbPaymentMethod->Items->Add(L"Monthly");
	cmbPaymentMethod->Items->Add(L"Yearly");
	cmbPaymentMethod->Items->Add(L"Quartely");
	cmbPaymentMethod->Items->Add(L"Bi-Yearly");
	cmbPaymentMethod->Items->Add(L"Daily");
	cmbPaymentMethod->SelectedIndex = 0;
}

void MainWindow::OnBtnExit(Object^ sender, RoutedEventArgs^ e)
{
	Close();
}

void MainWindow::OnSelectionChange(Object^ sender, SelectionChangedEventArgs^ e)
{
	switch (cmbPaymentMethod->SelectedIndex)
	{
	case 0:
		paymentMethod = Monthly;
		break;

	case 1:
		paymentMethod = Yearly;
		break;

	case 2:
		paymentMethod = Quartly;
		break;

	case 3:
		paymentMethod = BiYearly;
		break;

	case 4:
		paymentMethod = Daily;
		break;
	}
}

void MainWindow::OnBtnPayment(Object^ sender, RoutedEventArgs^ e)
{
	try
	{
		// get all the information from the user interface
		// and pass it to the PaymentWindow class
		PaymentWindow^ payment = gcnew PaymentWindow();
		
		double interestRate = Double::Parse(txtInterest->Text);
		double amount = Double::Parse(txtPrinciple->Text);
		int years = Int32::Parse(txtYears->Text);

		payment->Method = paymentMethod;
		payment->InterestRate = interestRate;
		payment->Principle = amount;
		payment->Years = years;		

		payment->Owner = this;
		payment->Show();
	}
	catch(Exception^ e)
	{
		MessageBox::Show(e->Message, L"Error", MessageBoxButton::OK, MessageBoxImage::Error);
	}
}