C# PDF Form Library
How to open, insert, delete, update pdf file form field text using c# in Windows, web application

Online C# Tutorial to Insert, Delete and Update Fields in PDF Document with .NET PDF DLLs

ON THIS PAGE:

Overview
Add form fields
Retrieve all form fields
Select a field in a page by position
Select a field in a document by the name
Delete a form field in the page
Add fields to PDF page

In this C# tutorial, you learn how to add, read, select, and remove the following form fields on a PDF file in your .NET Windows, ASP.NET application

Radio Button
Check Box
Text Box
List Box
Combo Box
Button

How to read, edit PDF form fields from PDF file using C#

Download XDoc.PDF AcroForm editor C# library
Install C# library to edit PDF AcroForm fields from PDF document
Step by Step Tutorial

A bestC#.NET PDF document SDK library for PDF form field manipulation in Visual Studio .NET program
Support .NET WinForms, ASP.NET MVC in IIS, ASP.NET Ajax, Azure cloud service, DNN (DotNetNuke), SharePoint
Evaluation components for inserting, deleting and updating PDF form in Visual C# .NET WinForms and ASP.NET web application
Free online C# source codes provide best ways to create PDF forms and delete PDF forms in C#.NET framework project
A professional PDF form creator supports to create fillable PDF form in C#.NET
An advanced PDF form maker allows users to create editable PDF form in C#.NET
Able to add text field to specified PDF file position in C#.NET class
Support to change font size in PDF form
Able to delete form fields from adobe PDF file

Field inserting, deletion and update is the most basic field edit function. By using RaterEdge .NET PDF package, you can add form fields to existing pdf files, delete or remove form field in PDF page and update PDF field in C# application. C# sample codes are provided below to help you finish these task.

C# add form fields to an existing PDF file

The text and C# code below will show how to add form fields to an existing PDF file using C#

Create a new AFRadioButton object with page index, page position values set
Create some other field objects
Use method PDFFormHandler.AddFormFields() to add all field objects to an existing PDF file, and save to a new PDF file

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  add a radio button field with default setting
AFRadioButton field1 = new AFRadioButton("AF_RadioButton_01");
field1.PageIndex = 0;
field1.Position = new PointF(100F, 100F);
fields.Add(field1);

//  add a checkbox field with default setting
AFCheckBox field2 = new AFCheckBox("AF_CheckBox_01");
field2.PageIndex = 0;
field2.Position = new PointF(300F, 100F);
fields.Add(field2);

//  add a checkbox field with default setting
AFTextBox field3 = new AFTextBox("AF_TextBox_01");
field3.PageIndex = 0;
field3.Position = new PointF(100F, 300F);
fields.Add(field3);

//  add a list box field with default setting
AFListBox field4 = new AFListBox("AF_ListBox_01");
field4.PageIndex = 0;
field4.Position = new PointF(100F, 500F);
field4.Items = new String[4] { "Item 1", "Item 2", "Item 3", "Item 4" };
fields.Add(field4);

//  add a combo box field with default setting
AFComboBox field5 = new AFComboBox("AF_ComboBox_01");
field5.PageIndex = 0;
field5.Position = new PointF(300F, 500F);
field5.Items = new String[4] { "Item 1", "Item 2", "Item 3", "Item 4" };
fields.Add(field5);

//  add a button field with default setting
AFButton field6 = new AFButton("AF_Button_01");
field6.PageIndex = 0;
field6.Position = new PointF(100F, 700F);
fields.Add(field6);

//  add fields to the input file
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# retrieve all form fields from a PDF file

String inputFilePath = Program.RootPath + "\\" + "1_AF.pdf";

List<BaseFormField> fields = PDFFormHandler.GetFormFields(inputFilePath);
Console.WriteLine("Number of Fields: " + fields.Count);
if (fields.Count > 0)
{
    foreach (BaseFormField field in fields)
    {
        Console.WriteLine("Field");
        Console.WriteLine("  Name:     " + field.Name);
        Console.WriteLine("  Visible:  " + field.IsVisible);
        Console.WriteLine("  Page:     " + field.PageIndex);
        Console.WriteLine("  Position: " + field.Position.ToString());
        Console.WriteLine("  Size: " + field.Size.ToString());
    }
}

C# select a field in a page by position

String inputFilePath = Program.RootPath + "\\" + "1_AF.pdf";

//  select a field at position [110, 310] in page 1 (page index 0)
int pageIndex = 0;
PointF pos = new PointF(110, 310);
//  get the form field object
BaseFormField field = PDFFormHandler.GetFormField(inputFilePath, pageIndex, pos);
if (field != null)
{
    Console.WriteLine("Field " + field.Name + " in page " + field.PageIndex + " at " + field.Position.ToString());
}
else
{
    Console.WriteLine("Field " + field.Name + " does not exist");
}

C# select a field in a document by the name

String inputFilePath = Program.RootPath + "\\" + "1_AF.pdf";

//  select a field with name "AF_RadioButton_01"
String fieldName = @"AF_RadioButton_01";
//  get the form field object
BaseFormField field = PDFFormHandler.SelectFormField(inputFilePath, fieldName);
if (field != null)
{
    Console.WriteLine("Field " + field.Name + " in page " + field.PageIndex + " at " + field.Position.ToString());
}
else
{
    Console.WriteLine("Field " + field.Name + " does not exist");
}

C# delete a form field in the page

String inputFilePath = Program.RootPath + "\\" + "1_AF.pdf";
String outputFilePath = Program.RootPath + "\\" + "output.pdf";

//  delete a field at position [110, 310] in page 1 (page index 0)
int pageIndex = 0;
PointF pos = new PointF(110, 310);
//  remove the field and output the new document
int errCode = PDFFormHandler.RemoveFormField(inputFilePath, pageIndex, pos, outputFilePath);
if (errCode == 0)
{
    Console.WriteLine("Success");
}
else
{
    Console.WriteLine("Failed");
}

String inputFilePath = Program.RootPath + "\\" + "1_AF.pdf";
String outputFilePath = Program.RootPath + "\\" + "output.pdf";

//  remove a field by name and output the new document
String fieldName = "AF_RadioButton_01";
int errCode = PDFFormHandler.RemoveFormField(inputFilePath, fieldName, outputFilePath);
if (errCode == 0)
{
    Console.WriteLine("Success");
}
else
{
    Console.WriteLine("Failed");
}

C# add a Radio Button Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output0.pdf";

List<BaseFormField> fields = new List<BaseFormField>();
//  create a Radio Button Field object
AFRadioButton tbField = new AFRadioButton("AF_RadioButton_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [100 pixels, 250 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(100, 250);
//  size of the field: width 400 pixels, height 100 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(400, 100);
//  set field visible
tbField.IsVisible = true;
//  set the label of the Radio Button field
tbField.Text = "Radio Button";
tbField.SetTextFont(PSType1Font.Helvetica_Oblique, 12);
tbField.TextColor = System.Drawing.Color.Black;
//  set the alignment of the radio button and label text in the field region
tbField.HorizontalAlignment = HorizontalAlignment.Left;
tbField.VerticalAlignment = VerticalAlignment.Center;

fields.Add(tbField); 

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# add a Check Box Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output1.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  create a Check Box Field object
AFCheckBox tbField = new AFCheckBox("AF_CheckBox_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [150 pixels, 300 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(150, 300);
//  size of the field: width 300 pixels, height 80 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(300, 80);
//  set field visible
tbField.IsVisible = true;
//  set the label of the Check Box field
tbField.Text = "Check Box";
tbField.SetTextFont(PSType1Font.Helvetica, 16);
tbField.TextColor = System.Drawing.Color.Black;
//  set the alignment of the checkbox and label text in the field region
tbField.HorizontalAlignment = HorizontalAlignment.Center;
tbField.VerticalAlignment = VerticalAlignment.Center;

//  set the initial state of the CheckBox field to ON
tbField.IsChecked = true;

fields.Add(tbField);

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# add a Text Box Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output2.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  create a Text Box Field object
AFTextBox tbField = new AFTextBox("AF_TextBox_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [150 pixels, 300 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(150, 300);
//  size of the field: width 400 pixels, height 300 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(400, 300);
//  set field visible
tbField.IsVisible = true;
//  background of the text box: Light Gray
tbField.BackgroundColor = System.Drawing.Color.LightGray;
//  initial content and font and font size of the content in the text box
tbField.Text = "";
tbField.SetTextFont(PSType1Font.Helvetica, 12);
tbField.TextColor = System.Drawing.Color.Black;
//  multi-line flag: true
tbField.IsMultiLine = true;
//  readonly flag: false
tbField.IsReadOnly = false;
//  set border of the field: 3 pixels in width, lightblue
tbField.BorderWidth = 3;
tbField.BorderColor = System.Drawing.Color.LightBlue;

fields.Add(tbField);

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# add a List Box Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output3.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  create a List Box Field object
AFListBox tbField = new AFListBox("AF_ListBox_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [150 pixels, 300 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(150, 300);
//  size of the field: width 150 pixels, height 60 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(150, 60);
//  set field visible
tbField.IsVisible = true;
//  set option items in the list box
tbField.Items = new String[] { "Item 1", "Item 2", "Item 3", "Item 4" };
//  set properties of the item text
tbField.SetTextFont(PSType1Font.Helvetica, 12);
tbField.TextColor = System.Drawing.Color.Black;
//  set border of the field: 2 pixels in width, black
tbField.BorderWidth = 2;
tbField.BorderColor = System.Drawing.Color.Black;
//  multi-selection flag: false
tbField.IsMultiSelect = false;

fields.Add(tbField);

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# add a Combo Box Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output4.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  create a Combo Box Field object
AFComboBox tbField = new AFComboBox("AF_ComboBox_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [150 pixels, 300 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(150, 300);
//  size of the field: width 150 pixels, height 30 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(150, 30);
//  set field visible
tbField.IsVisible = true;
//  set field background color: lightgray
tbField.BackgroundColor = System.Drawing.Color.LightGray;
//  set option items in the combo box
tbField.Items = new String[] { "Item 1", "Item 2", "Item 3", "Item 4" };
//  set properties of the item text
tbField.SetTextFont(PSType1Font.Helvetica, 12);
tbField.TextColor = System.Drawing.Color.Black;
//  set border of the field: 2 pixels in width, black
tbField.BorderWidth = 2;
tbField.BorderColor = System.Drawing.Color.Black;

//  set inital selected index: 2 (the 3rd item)
tbField.SelectedIndex = 2;

fields.Add(tbField);

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

C# add a Button Field to PDF document

String inputFilePath = Program.RootPath + "\\" + "empty.pdf";
String outputFilePath = Program.RootPath + "\\" + "Output5.pdf";

List<BaseFormField> fields = new List<BaseFormField>();

//  create a Push Button Field object
AFButton tbField = new AFButton("AF_Button_01");
//  in first page (page index 0)
tbField.PageIndex = 0;
//  position of top left corner of the field: [150 pixels, 300 pixels] (in 96 dpi)
tbField.Position = new System.Drawing.PointF(150, 300);
//  size of the field: width 120 pixels, height 30 pixels (in 96 dpi)
tbField.Size = new System.Drawing.SizeF(120, 30);
//  set field visible
tbField.IsVisible = true;
//  set field background color: gray
tbField.BackgroundColor = System.Drawing.Color.Gray;
//  set label in the push button
tbField.Text = "CLICK";
tbField.SetTextFont(PSType1Font.Helvetica, 16);
tbField.TextColor = System.Drawing.Color.Black;
//  set border of the field: 1 pixel in width, drakgray
tbField.BorderColor = System.Drawing.Color.DarkGray;
tbField.BorderWidth = 1;

fields.Add(tbField);

//  add fields
PDFFormHandler.AddFormFields(inputFilePath, fields, outputFilePath);

Copyright © <2000-2024> by <RasterEdge.com>. All Rights Reserved. RasterEdge.com is professional ASP.NET Document Viewer Control, ASP.NET MVC Document Viewer, ASP.NET PDF Viewer, MVC PDF Viewer and ASP.NET PDF Editor Control provider for document, content and imaging solutions, available for ASP.NET AJAX, Silverlight, Windows Forms as well as WPF. We are dedicated to provide powerful & profession imaging controls and components for capturing, viewing, processing, converting, compressing and storing images, documents and more.

C# PDF Form Library How to open, insert, delete, update pdf file form field text using c# in Windows, web application