public static void Main() { // NOTE: // When used in trial mode, the library imposes some restrictions. // Please visit http://bitmiracle.com/pdf-library/trial-restrictions.aspx // for more information. string pathToFile = "Comboboxes.pdf"; using (PdfDocument pdf = new PdfDocument()) { PdfPage page = pdf.Pages[0]; PdfComboBox comboBox = page.AddComboBox(10, 50, 120, 15); comboBox.AddItem("First item"); comboBox.AddItem("Second item"); comboBox.AddItem("Third item"); comboBox.Border.Color = new PdfRgbColor(255, 0, 0); comboBox.Text = "Second item"; PdfComboBox comboBox2 = page.AddComboBox(10, 80, 120, 15); comboBox2.AddItem("First item"); comboBox2.AddItem("Second item"); comboBox2.HasEditField = false; pdf.Save(pathToFile); } Console.WriteLine($"The output is located in {Environment.CurrentDirectory}"); }