Create a PDF Form in a PDF Document

protected void createPdf()
{
    // Get the server IP and port
    String serverIP = textBoxServerIP.Text;
    uint serverPort = uint.Parse(textBoxServerPort.Text);

    // Create a PDF document
    Document pdfDocument = null;
    if (radioButtonUseTcpService.Checked)
        pdfDocument = new Document(serverIP, serverPort);
    else
        pdfDocument = new Document(true, textBoxWebServiceUrl.Text);

    // Set optional service password
    if (textBoxServicePassword.Text.Length > 0)
        pdfDocument.ServicePassword = textBoxServicePassword.Text;

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Add a page to PDF document
    PdfPage pdfPage = pdfDocument.AddPage();

    // The font used for titles in PDF document
    PdfFont titlesFont = new PdfFont("Times New Roman", 10, true);
    titlesFont.Bold = true;
    // The font used for field names in PDF document
    PdfFont fieldNameFont = new PdfFont("Times New Roman", 10, true);
    // The font used for buttons text in PDF document
    PdfFont buttonTextFont = new PdfFont("Times New Roman", 10, false);
    // The font used for PDF form text box fields
    PdfFont textFieldFont = new PdfFont(StdFontBaseFamily.Helvetica, 8);
    // The font used for PDF form combo box fields
    PdfFont comboBoxFieldFont = new PdfFont(StdFontBaseFamily.Helvetica, 8);

    // Add document title
    TextElement titleTextElement = new TextElement(5, 5, "Create PDF Forms", titlesFont);
    pdfPage.AddElement(titleTextElement);

    // Add a text box field to PDF form
    TextElement fieldNameTextElement = new TextElement(5, 30, 60, "First name:", fieldNameFont);
    pdfPage.AddElement(fieldNameTextElement);
    RectangleFloat fieldBoundingRectangle = new RectangleFloat(0, 50, 150, 15);
    // Create the form field
    PdfFormTextBox firstNameTextBoxField = new PdfFormTextBox(fieldBoundingRectangle, "Enter First Name", textFieldFont);
    pdfDocument.AddFormField(firstNameTextBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    firstNameTextBoxField.Name = "firstName";
    // Set the form field default value
    firstNameTextBoxField.DefaultValue = "A default first name";
    // Set form field style 
    firstNameTextBoxField.Style.BackColor = RgbColor.AliceBlue;

    // Add a text box field to PDF form
    fieldNameTextElement = new TextElement(0, 75, 60, "Last name:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);
    fieldBoundingRectangle = new RectangleFloat(0, 90, 150, 15);
    // Create the form field
    PdfFormTextBox textBoxField = new PdfFormTextBox(fieldBoundingRectangle, "Enter Last Name", textFieldFont);
    pdfDocument.AddFormField(textBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    textBoxField.Name = "lastName";
    // Set the form field default value
    textBoxField.DefaultValue = "A default last name";
    // Set form field style 
    textBoxField.Style.BackColor = RgbColor.MistyRose;

    // Add a password text box field to PDF form
    fieldNameTextElement = new TextElement(0, 105, 60, "Password:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);
    fieldBoundingRectangle = new RectangleFloat(0, 120, 150, 15);
    // Create the form field
    PdfFormTextBox passwordTextBoxField = new PdfFormTextBox(fieldBoundingRectangle, "", textFieldFont);
    pdfDocument.AddFormField(passwordTextBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    passwordTextBoxField.Name = "password";
    // Set form field style 
    passwordTextBoxField.Style.BackColor = RgbColor.AliceBlue;
    // Set the password mode for the text box
    passwordTextBoxField.IsPassword = true;

    // Add a radio buttons group to PDF form
    fieldNameTextElement = new TextElement(0, 0, 60, "Gender:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);

    // Create the radio buttons group
    PdfFormRadioButtonsGroup radioButtonsGroup = new PdfFormRadioButtonsGroup();
    pdfDocument.AddFormField(radioButtonsGroup);
    // Set unique form field name used when the form is submitted
    radioButtonsGroup.Name = "gender";
    // Set style of the radio buttons in this group
    radioButtonsGroup.Style.BackColor = RgbColor.AntiqueWhite;

    // Add the first radio button to group
    RectangleFloat radioButtonRectangle = new RectangleFloat(0, 0, 50, 10);
    // Create the form field
    PdfFormRadioButton radioButtonFieldMale = new PdfFormRadioButton(radioButtonRectangle, "male");
    radioButtonsGroup.AddRadioButton(radioButtonFieldMale, 10, true, false, 0, true, false);

    fieldNameTextElement = new TextElement(0, 0, 30, "Male", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, true, false, 0, true, false);

    // Add the second radio button to group
    radioButtonRectangle = new RectangleFloat(0, 0, 50, 10);
    // Create the form field
    PdfFormRadioButton radioButtonFieldFemale = new PdfFormRadioButton(radioButtonRectangle, "female");
    radioButtonsGroup.AddRadioButton(radioButtonFieldFemale, 15, true, false, 0, true, false);

    fieldNameTextElement = new TextElement(0, 0, 30, "Female", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, true, false, 0, true, false);

    // Set the selected radio btton in group
    radioButtonsGroup.SetCheckedRadioButton(radioButtonFieldFemale);

    // Add a checkbox field to PDF form
    fieldNameTextElement = new TextElement(0, 0, 60, "Vehicle:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);
    fieldBoundingRectangle = new RectangleFloat(0, 0, 10, 10);
    // Create the form field
    PdfFormCheckBox checkBoxField = new PdfFormCheckBox(fieldBoundingRectangle, true);
    pdfDocument.AddFormField(checkBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    checkBoxField.Name = "haveCar";
    // Set form field style 
    checkBoxField.Style.BackColor = RgbColor.AntiqueWhite;
    // Set checkbox field checked state
    checkBoxField.Checked = true;

    fieldNameTextElement = new TextElement(0, 0, 50, "I have a car", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 10, true, false, 0, true, false);

    // Add a combo box list field to PDF form
    fieldNameTextElement = new TextElement(0, 0, 60, "Vehicle Type:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);

    fieldBoundingRectangle = new RectangleFloat(0, 0, 50, 15);
    string[] comboBoxItems = new string[] { "Volvo", "Saab", "Audi", "Opel" };
    // Create the form field
    PdfFormComboBox comboBoxField = new PdfFormComboBox(fieldBoundingRectangle, comboBoxItems, comboBoxFieldFont);
    pdfDocument.AddFormField(comboBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    comboBoxField.Name = "vehicleType";
    // Set the form field default value
    comboBoxField.DefaultValue = "Audi";
    // Set form field style 
    comboBoxField.Style.BackColor = RgbColor.LightCyan;
    // Set selected item in combo box
    comboBoxField.Value = "Audi";

    // Add a multiline text box field to PDF form
    fieldNameTextElement = new TextElement(0, 0, 60, "Comments:", fieldNameFont);
    pdfDocument.AddElement(fieldNameTextElement, 5, false, 10, true);

    fieldBoundingRectangle = new RectangleFloat(0, 0, 150, 60);
    // Create the form field
    PdfFormTextBox multilineTextBoxField = new PdfFormTextBox(fieldBoundingRectangle,
            "Enter your comments here:\r\nFirst comment line\r\nSecond comment line", textFieldFont);
    pdfDocument.AddFormField(multilineTextBoxField, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    multilineTextBoxField.Name = "comments";
    // Set form field style 
    multilineTextBoxField.Style.BackColor = RgbColor.AliceBlue;
    // Set the multiline mode for text box field
    multilineTextBoxField.IsMultiLine = true;

    // Add a form submit button to PDF form
    fieldBoundingRectangle = new RectangleFloat(0, 0, 75, 15);
    PdfFormButton submitFormButton = new PdfFormButton(fieldBoundingRectangle, "Submit", buttonTextFont);
    pdfDocument.AddFormField(submitFormButton, 5, false, 10, true);
    // Set unique form field name used when the form is submitted
    submitFormButton.Name = "submitFormButton";
    // Set form field style 
    submitFormButton.Style.BackColor = RgbColor.Beige;
    // Create the form submit action
    PdfSubmitFormAction submitFormAction = new PdfSubmitFormAction(submitUrlTextBox.Text);
    submitFormAction.Flags |= PdfFormSubmitFlags.ExportFormat;
    if (getMethodRadioButton.Checked)
        submitFormAction.Flags |= PdfFormSubmitFlags.GetMethod;
    // Set the form submit button action
    submitFormButton.Action = submitFormAction;

    // Add a form reset button to PDF form
    fieldBoundingRectangle = new RectangleFloat(0, 0, 75, 15);
    PdfFormButton resetFormButton = new PdfFormButton(fieldBoundingRectangle, "Reset", buttonTextFont);
    pdfDocument.AddFormField(resetFormButton, 10, true, false, 0, true, false);
    // Set unique form field name used when the form is submitted
    resetFormButton.Name = "resetFormButton";
    // Set form field style 
    resetFormButton.Style.BackColor = RgbColor.Beige;
    // Create the form reset action
    PdfResetFormAction resetFormAction = new PdfResetFormAction();

    // Set the form reset button action
    resetFormButton.Action = resetFormAction;

    // Save the PDF document in a memory buffer
    byte[] outPdfBuffer = pdfDocument.Save();
}