.NETソフトウェア開発（開発者向けの動作方法）

private void SetupDataGridViewColumns()
{
    invoiceDataGridView.Columns.Clear(); // Clear existing columns if any
    // Add columns specifying the details to be displayed in the invoice
    invoiceDataGridView.Columns.Add("itemIdColumn", "Item ID");
    invoiceDataGridView.Columns.Add("descriptionColumn", "Description");
    invoiceDataGridView.Columns.Add("quantityColumn", "Quantity");
    invoiceDataGridView.Columns.Add("unitPriceColumn", "Unit Price");
    invoiceDataGridView.Columns.Add("totalPriceColumn", "Total Price");
    // Set the Total Price column to read-only as it will be calculated automatically
    invoiceDataGridView.Columns["totalPriceColumn"].ReadOnly = true;
    // Add a button column for delete action
    DataGridViewButtonColumn deleteButtonColumn = new DataGridViewButtonColumn();
    deleteButtonColumn.HeaderText = "";
    deleteButtonColumn.Name = "deleteButtonColumn";
    deleteButtonColumn.Text = "Delete";
    deleteButtonColumn.UseColumnTextForButtonValue = true; // Set the button text to "Delete"
    // Add the delete button column to the DataGridView
    invoiceDataGridView.Columns.Add(deleteButtonColumn);
}

public Form1()
{
    InitializeComponent();
    SetupDataGridViewColumns();
    // Wire up the CellClick event to a handler to manage deletion of items
    invoiceDataGridView.CellClick += invoiceDataGridView_CellClick;
}

private void invoiceDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
    // If the clicked cell is part of the button column and not the header row
    if (e.ColumnIndex == invoiceDataGridView.Columns["deleteButtonColumn"].Index && e.RowIndex >= 0)
    {
        // Confirm delete operation
        if (MessageBox.Show("Are you sure you want to delete this item?", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
        {
            // Remove the row from the DataGridView
            invoiceDataGridView.Rows.RemoveAt(e.RowIndex);
        }
    }
}

Private Sub SetupDataGridViewColumns()
	invoiceDataGridView.Columns.Clear() ' Clear existing columns if any
	' Add columns specifying the details to be displayed in the invoice
	invoiceDataGridView.Columns.Add("itemIdColumn", "Item ID")
	invoiceDataGridView.Columns.Add("descriptionColumn", "Description")
	invoiceDataGridView.Columns.Add("quantityColumn", "Quantity")
	invoiceDataGridView.Columns.Add("unitPriceColumn", "Unit Price")
	invoiceDataGridView.Columns.Add("totalPriceColumn", "Total Price")
	' Set the Total Price column to read-only as it will be calculated automatically
	invoiceDataGridView.Columns("totalPriceColumn").ReadOnly = True
	' Add a button column for delete action
	Dim deleteButtonColumn As New DataGridViewButtonColumn()
	deleteButtonColumn.HeaderText = ""
	deleteButtonColumn.Name = "deleteButtonColumn"
	deleteButtonColumn.Text = "Delete"
	deleteButtonColumn.UseColumnTextForButtonValue = True ' Set the button text to "Delete"
	' Add the delete button column to the DataGridView
	invoiceDataGridView.Columns.Add(deleteButtonColumn)
End Sub

'INSTANT VB WARNING: The following constructor is declared outside of its associated class:
'ORIGINAL LINE: public Form1()
Public Sub New()
	InitializeComponent()
	SetupDataGridViewColumns()
	' Wire up the CellClick event to a handler to manage deletion of items
	AddHandler invoiceDataGridView.CellClick, AddressOf invoiceDataGridView_CellClick
End Sub

Private Sub invoiceDataGridView_CellClick(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs)
	' If the clicked cell is part of the button column and not the header row
	If e.ColumnIndex = invoiceDataGridView.Columns("deleteButtonColumn").Index AndAlso e.RowIndex >= 0 Then
		' Confirm delete operation
		If MessageBox.Show("Are you sure you want to delete this item?", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = DialogResult.Yes Then
			' Remove the row from the DataGridView
			invoiceDataGridView.Rows.RemoveAt(e.RowIndex)
		End If
	End If
End Sub

public void AddItemToInvoice(string itemId, string description, int quantity, decimal unitPrice)
{
    decimal totalPrice = quantity * unitPrice;
    invoiceDataGridView.Rows.Add(itemId, description, quantity, unitPrice, totalPrice);
}

private void CalculateTotalAmount()
{
    decimal totalAmount = 0m;
    foreach (DataGridViewRow row in invoiceDataGridView.Rows)
    {
        totalAmount += Convert.ToDecimal(row.Cells["totalPriceColumn"].Value ?? 0);
    }
    // Display the total amount accumulated
    lblTotalAmount.Text = $"{totalAmount:C2}";
}

private void btnAddItem_Click(object sender, EventArgs e)
{
    // Collect data from input controls
    string itemId = txtItemID.Text;
    string description = txtDescription.Text;
    int quantity = (int)numericUpDownQuantity.Value;
    decimal unitPrice;
    // Validate the collected data
    bool isUnitPriceValid = decimal.TryParse(txtUnitPrice.Text, out unitPrice);
    if (string.IsNullOrEmpty(itemId) || string.IsNullOrEmpty(description) || quantity <= 0 || !isUnitPriceValid || unitPrice <= 0)
    {
        MessageBox.Show("Please enter valid data for all fields.", "Invalid Data", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        return;
    }
    // Add data to the DataGridView
    AddItemToInvoice(itemId, description, quantity, unitPrice);
    // Clear the input fields after adding the item to the grid
    txtItemID.Clear();
    txtDescription.Clear();
    txtUnitPrice.Clear();
    numericUpDownQuantity.Value = 0;
    CalculateTotalAmount();
}

Imports System

Public Sub AddItemToInvoice(ByVal itemId As String, ByVal description As String, ByVal quantity As Integer, ByVal unitPrice As Decimal)
	Dim totalPrice As Decimal = quantity * unitPrice
	invoiceDataGridView.Rows.Add(itemId, description, quantity, unitPrice, totalPrice)
End Sub

Private Sub CalculateTotalAmount()
	Dim totalAmount As Decimal = 0D
	For Each row As DataGridViewRow In invoiceDataGridView.Rows
		totalAmount += Convert.ToDecimal(If(row.Cells("totalPriceColumn").Value, 0))
	Next row
	' Display the total amount accumulated
	lblTotalAmount.Text = $"{totalAmount:C2}"
End Sub

Private Sub btnAddItem_Click(ByVal sender As Object, ByVal e As EventArgs)
	' Collect data from input controls
	Dim itemId As String = txtItemID.Text
	Dim description As String = txtDescription.Text
	Dim quantity As Integer = CInt(Math.Truncate(numericUpDownQuantity.Value))
	Dim unitPrice As Decimal = Nothing
	' Validate the collected data
	Dim isUnitPriceValid As Boolean = Decimal.TryParse(txtUnitPrice.Text, unitPrice)
	If String.IsNullOrEmpty(itemId) OrElse String.IsNullOrEmpty(description) OrElse quantity <= 0 OrElse Not isUnitPriceValid OrElse unitPrice <= 0 Then
		MessageBox.Show("Please enter valid data for all fields.", "Invalid Data", MessageBoxButtons.OK, MessageBoxIcon.Warning)
		Return
	End If
	' Add data to the DataGridView
	AddItemToInvoice(itemId, description, quantity, unitPrice)
	' Clear the input fields after adding the item to the grid
	txtItemID.Clear()
	txtDescription.Clear()
	txtUnitPrice.Clear()
	numericUpDownQuantity.Value = 0
	CalculateTotalAmount()
End Sub

private void btnInvoice_Click(object sender, EventArgs e)
{
    IronPdf.License.LicenseKey = "your-license-key"; // Replace with your IronPDF license key
    var customerName = txtName.Text;
    var customerEmail = txtEmail.Text;
    var customerAddress = txtAddress.Text;
    var customerPhone = txtPhone.Text;
    var htmlStringBuilder = new StringBuilder();
    htmlStringBuilder.Append("<html>");
    htmlStringBuilder.Append("<head>");
    htmlStringBuilder.Append("<title>Invoice</title>");
    htmlStringBuilder.Append(@"
        <style>
            body { font-family: 'Arial', sans-serif; }
            h1 { color: #333; text-align: center; }
            table { width: 100%; border-collapse: collapse; margin-top: 20px; }
            th, td { border: 1px solid #999; padding: 8px; text-align: left; }
            th { background-color: #f2f2f2; }
            tr:nth-child(even) { background-color: #f9f9f9; }
            h2 { text-align: right; margin-top: 20px; }
            .customer-info { line-height: 1.6; margin-bottom: 20px; }
            .customer-info p { margin: 0 0 10px 0; color: #333; }
            .customer-info label { font-weight: bold; }
        </style>");
    htmlStringBuilder.Append("</head>");
    htmlStringBuilder.Append("<body>");
    htmlStringBuilder.Append("<h1>Invoice</h1>");
    htmlStringBuilder.Append("<div class='customer-info'>");
    htmlStringBuilder.Append($"<p><strong>Customer Name:</strong> {customerName}</p>");
    htmlStringBuilder.Append($"<p><strong>Customer Email:</strong> {customerEmail}</p>");
    htmlStringBuilder.Append($"<p><strong>Customer Address:</strong> {customerAddress}</p>");
    htmlStringBuilder.Append($"<p><strong>Customer Phone:</strong> {customerPhone}</p>");
    htmlStringBuilder.Append("</div>");
    htmlStringBuilder.Append("<table><tr><th>Item ID</th><th>Description</th><th>Quantity</th><th>Unit Price</th><th>Total Price</th></tr>");
    foreach (DataGridViewRow row in invoiceDataGridView.Rows)
    {
        if (row.IsNewRow) continue; 
        htmlStringBuilder.Append("<tr>");
        htmlStringBuilder.Append($"<td>{row.Cells["itemIdColumn"].Value}</td>");
        htmlStringBuilder.Append($"<td>{row.Cells["descriptionColumn"].Value}</td>");
        htmlStringBuilder.Append($"<td>{row.Cells["quantityColumn"].Value}</td>");
        htmlStringBuilder.Append($"<td>{row.Cells["unitPriceColumn"].Value:C2}</td>");
        htmlStringBuilder.Append($"<td>{row.Cells["totalPriceColumn"].Value:C2}</td>");
        htmlStringBuilder.Append("</tr>");
    }
    htmlStringBuilder.Append("</table>");
    htmlStringBuilder.Append($"<h2>Total Amount: {lblTotalAmount.Text}</h2>");
    htmlStringBuilder.Append("</body></html>");
    var renderer = new IronPdf.ChromePdfRenderer();
    var pdfDocument = renderer.RenderHtmlAsPdf(htmlStringBuilder.ToString());
    string savePath = Path.Combine($"F:\\Invoice_{DateTime.Now:yyyyMMddHHmmss}.pdf");
    pdfDocument.SaveAs(savePath);
    MessageBox.Show("The invoice has been successfully saved to your desktop.", "Invoice Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

Private Sub btnInvoice_Click(ByVal sender As Object, ByVal e As EventArgs)
	IronPdf.License.LicenseKey = "your-license-key" ' Replace with your IronPDF license key
	Dim customerName = txtName.Text
	Dim customerEmail = txtEmail.Text
	Dim customerAddress = txtAddress.Text
	Dim customerPhone = txtPhone.Text
	Dim htmlStringBuilder = New StringBuilder()
	htmlStringBuilder.Append("<html>")
	htmlStringBuilder.Append("<head>")
	htmlStringBuilder.Append("<title>Invoice</title>")
	htmlStringBuilder.Append("
        <style>
            body { font-family: 'Arial', sans-serif; }
            h1 { color: #333; text-align: center; }
            table { width: 100%; border-collapse: collapse; margin-top: 20px; }
            th, td { border: 1px solid #999; padding: 8px; text-align: left; }
            th { background-color: #f2f2f2; }
            tr:nth-child(even) { background-color: #f9f9f9; }
            h2 { text-align: right; margin-top: 20px; }
            .customer-info { line-height: 1.6; margin-bottom: 20px; }
            .customer-info p { margin: 0 0 10px 0; color: #333; }
            .customer-info label { font-weight: bold; }
        </style>")
	htmlStringBuilder.Append("</head>")
	htmlStringBuilder.Append("<body>")
	htmlStringBuilder.Append("<h1>Invoice</h1>")
	htmlStringBuilder.Append("<div class='customer-info'>")
	htmlStringBuilder.Append($"<p><strong>Customer Name:</strong> {customerName}</p>")
	htmlStringBuilder.Append($"<p><strong>Customer Email:</strong> {customerEmail}</p>")
	htmlStringBuilder.Append($"<p><strong>Customer Address:</strong> {customerAddress}</p>")
	htmlStringBuilder.Append($"<p><strong>Customer Phone:</strong> {customerPhone}</p>")
	htmlStringBuilder.Append("</div>")
	htmlStringBuilder.Append("<table><tr><th>Item ID</th><th>Description</th><th>Quantity</th><th>Unit Price</th><th>Total Price</th></tr>")
	For Each row As DataGridViewRow In invoiceDataGridView.Rows
		If row.IsNewRow Then
			Continue For
		End If
		htmlStringBuilder.Append("<tr>")
		htmlStringBuilder.Append($"<td>{row.Cells("itemIdColumn").Value}</td>")
		htmlStringBuilder.Append($"<td>{row.Cells("descriptionColumn").Value}</td>")
		htmlStringBuilder.Append($"<td>{row.Cells("quantityColumn").Value}</td>")
		htmlStringBuilder.Append($"<td>{row.Cells("unitPriceColumn").Value:C2}</td>")
		htmlStringBuilder.Append($"<td>{row.Cells("totalPriceColumn").Value:C2}</td>")
		htmlStringBuilder.Append("</tr>")
	Next row
	htmlStringBuilder.Append("</table>")
	htmlStringBuilder.Append($"<h2>Total Amount: {lblTotalAmount.Text}</h2>")
	htmlStringBuilder.Append("</body></html>")
	Dim renderer = New IronPdf.ChromePdfRenderer()
	Dim pdfDocument = renderer.RenderHtmlAsPdf(htmlStringBuilder.ToString())
	Dim savePath As String = Path.Combine($"F:\Invoice_{DateTime.Now:yyyyMMddHHmmss}.pdf")
	pdfDocument.SaveAs(savePath)
	MessageBox.Show("The invoice has been successfully saved to your desktop.", "Invoice Saved", MessageBoxButtons.OK, MessageBoxIcon.Information)
End Sub