Fill AcroForm - Fill PDF Form using C#

The following code snippet also work with Aspose.PDF.Drawing library.

Fill Form Field in a PDF Document

To populate a form field, get the field from the Document object’s Form collection and set its value using the appropriate property for the field type (such as Value for text fields, Checked for check boxes, or Selected for list boxes).

In this example, various fields are selected and their properties are set.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void FillFormField()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "DocumentWithSomeFields.pdf"))
    {
        // Set value for TextBoxField
        var textBoxField = document.Form["textField"] as Aspose.Pdf.Forms.TextBoxField;
        textBoxField.Value = "Value to be filled in the field";

        // Add option for ListBoxField and select it
        var listBoxField = document.Form["listField"] as Aspose.Pdf.Forms.ListBoxField;
        listBoxField.AddOption("Orange");
        listBoxField.Selected = listBoxField.Options.Count;

        // Set check for CheckboxField
        var checkboxField = document.Form["checkField"] as Aspose.Pdf.Forms.CheckboxField;
        checkboxField.Checked = true;

        // Set check for first option of RadioButtonField
        var radioField = document.Form["radioGroup"] as Aspose.Pdf.Forms.RadioButtonField;
        radioField.Options[1].Selected = true;

        // Save PDF document
        document.Save(dataDir + "DocumentWithSomeFields_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void FillFormField()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "DocumentWithSomeFields.pdf");

    // Set value for TextBoxField
    var textBoxField = document.Form.OfType<Aspose.Pdf.Forms.TextBoxField>().First();
    textBoxField.Value = "Value to be filled in the field";

    // Add option for ListBoxField and select it
    var listBoxField = document.Form.OfType<Aspose.Pdf.Forms.ListBoxField>().First();
    listBoxField.AddOption("Orange");
    listBoxField.Selected = listBoxField.Options.Count;

    // Set check for CheckboxField
    var checkboxField = document.Form.OfType<Aspose.Pdf.Forms.CheckboxField>().First();
    checkboxField.Checked = true;

    // Set check for first option of RadioButtonField
    var radioField = document.Form.OfType<Aspose.Pdf.Forms.RadioButtonField>().First();
    radioField.Options[1].Selected = true;

    // Save PDF document
    document.Save(dataDir + "DocumentWithSomeFields_out.pdf");
}