CombTextBoxField class

Updated on May 11, 2026

This article describes the following topics:

• CombTextBoxField Class Overview

• CombTextBoxField Class Properties

Overview

This class corresponds to FormFieldType.CombTextBox enum value and represents a text input data container which restricts its text to some specific length and the characters are equally distributed through the field appearance length.

Properties

CombTextBoxField provides the following properties:

Property	Description
Value	Gets or sets the current text value of the field.
DefaultValue	Gets or sets the default value used when the AcroForm is reset to its default values.
Widgets	The collection of Widget annotations representing the field on the PDF pages. Widgets are created using AddWidget() and can be removed using Remove(). Implements IEnumerable.
MaxLengthOfInputCharacters	Specifies the number of characters that can be inputted.

Example 1: Create a CombTextBoxField and add it to a page

C#

CombTextBoxField combTextBoxField = new CombTextBoxField("SampleCombTextBox")
{
    MaxLengthOfInputCharacters = 4,
    DefaultValue = "2017",
    Value = "2017",
};

VariableContentWidget widget = combTextBoxField.Widgets.AddWidget();
widget.Rect = new Rect(0, 0, 250, 50);
widget.RecalculateContent();

document.AcroForm.FormFields.Add(combTextBoxField);
document.Pages[0].Annotations.Add(widget);

See Also

• Form Field
• Widgets
• Create Interactive Forms SDK example
• Modifying Forms SDK example