Programmatically Insert Editable Textbox in PDF

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Textbox is one type of form fields in PDF, which allows users to enter data into PDF without any editing software. It is commonly used in a document to obtain information of the readers. This article presents how to insert editable textbox in a PDF programmatically using free PDF API in C#.
This PDF library provides a class of PdfTextBoxField, initialize a new object of the class and set it properties likeBounds, BounderWidth, then you can add the textbox to PDF document by Form.Fields.Add() method.
Using the code
//Create a new object of PdfDoument, insert a page
PdfDocument doc = new PdfDocument();
PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, new PdfMargins());
//Set font, brush
PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Bold);
PdfBrush brush = PdfBrushes.Black;
float x = 50;
float y = 50;
float tempX = 0;
//Draw sting in Pdf
string text = "Phone Number: ";
page.Canvas.DrawString(text, font, brush, x, y);
//Insert textbox
tempX = font.MeasureString(text).Width + x + 15;
PdfTextBoxField textbox = new PdfTextBoxField(page, "TextBox");
textbox.Bounds = new RectangleF(tempX, y, 100, 15);
textbox.BorderWidth = 0.75f;
textbox.BorderStyle = PdfBorderStyle.Solid;doc.Form.Fields.Add(textbox);
//Add a tooltip to textbox
doc.Form.Fields["TextBox"].ToolTip = "Please insert a valid phone Number";
doc.SaveToFile("sample.pdf", FileFormat.PDF);
Output


2016-04-06_163155

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