Update Word form controls in C# and VB.NET

Name: GemBox.Document
Author: GemBox Ltd.

The following example shows how you can write or modify values of an existing text, checkbox, and drop-down form fields in a Word document using the GemBox.Document component.

using GemBox.Document;
using System;

// If using the Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");

var document = DocumentModel.Load("FormFilled.docx");

// Get a snapshot of all form fields in the document.
var formData = document.Content.FormFieldsData;

// Update "FullName" text field.
var fullNameData = (FormTextData)formData["FullName"];
fullNameData.Value = "Jane Doe";

// Update "BirthDate" text field.
var birthDateData = (FormTextData)formData["BirthDate"];
birthDateData.Value = new DateTime(2000, 2, 29);

// Check "Married" check-box field.
var marriedData = (FormCheckBoxData)formData["Married"];
marriedData.Value = true;

// Select "Female" from drop-down field.
var genderData = (FormDropDownData)formData["Gender"];
genderData.SelectedItemIndex = genderData.Items.IndexOf("Female");

document.Save("Form Updated.docx");

Imports GemBox.Document
Imports System

Module Program

    Sub Main()

        ' If using the Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY")

        Dim document = DocumentModel.Load("FormFilled.docx")

        ' Get a snapshot of all form fields in the document.
        Dim formData = document.Content.FormFieldsData

        ' Update "FullName" text field.
        Dim fullNameData = DirectCast(formData("FullName"), FormTextData)
        fullNameData.Value = "Jane Doe"

        ' Update "BirthDate" text field.
        Dim birthDateData = DirectCast(formData("BirthDate"), FormTextData)
        birthDateData.Value = New DateTime(2000, 2, 29)

        ' Check "Married" check-box field.
        Dim marriedData = DirectCast(formData("Married"), FormCheckBoxData)
        marriedData.Value = True

        ' Select "Female" from drop-down field.
        Dim genderData = DirectCast(formData("Gender"), FormDropDownData)
        genderData.SelectedItemIndex = genderData.Items.IndexOf("Female")

        document.Save("Form Updated.docx")

    End Sub
End Module

Updating a Word document's text, checkbox and drop-down form fields in C# and VB.NET — Screenshot of a Word file with updated form field values

When setting the FormText field's value to an IFormattable type (like a number or a date), the field's resulting text will depend on the value of FormTextData.ValueFormat.

Update Word form controls in C# and VB.NET

See also

Next steps