---
title: "Extract data from PDF form fields  | Nutrient .NET SDK"
canonical_url: "https://www.nutrient.io/guides/dotnet/forms/extract-form-data/"
md_url: "https://www.nutrient.io/guides/dotnet/forms/extract-form-data.md"
last_updated: "2026-05-21T17:12:02.203Z"
description: "Learn how to extract data from PDF form fields programmatically in C# .NET using Nutrient .NET SDK. Retrieve user-entered information from interactive forms."
---

# Extract data from PDF form fields in C# .NET

To extract data from form fields in a PDF document, follow the steps below:

1. Create a `GdPicturePDF` object.

2. Load the PDF file with the [`LoadFromFile` method](https://www.nutrient.io/api/gdpicture/GdPicture.NET.14~GdPicture14.GdPicturePDF~LoadFromFile.html).

3. Get the total number of form fields in the PDF document with the [`GetFormFieldsCount` method](https://www.nutrient.io/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~GetFormFieldsCount.html).

4. Loop through all the form fields.

5. Use any method to get the form field data and save it to a variable. For more information, refer to the [read form fields](https://www.nutrient.io/guides/dotnet/forms/read-form-fields.md) guide.

The following code example gets the field ID, type, and page location of all form fields and saves them to a CSV file:

### C#

```csharp

using GdPicturePDF gdpicturePDF = new GdPicturePDF();

// Create a `StringBuilder` variable to store data.
StringBuilder data = new StringBuilder();
// Add headers to the first line.
String[] headers = {"Field ID", "Field Type", "Field Location Page"};
data.AppendLine(string.Join(";", headers));

gdpicturePDF.LoadFromFile(@"C:\temp\source.pdf");
// Get the form field count.
int fieldCount = gdpicturePDF.GetFormFieldsCount();
// Loop through all form fields.
for (int i = 0; i < fieldCount; i++)
{
    // Get the field ID, type, and page location of each form field.
    int fieldID = gdpicturePDF.GetFormFieldId(i);
    PdfFormFieldType fieldType = gdpicturePDF.GetFormFieldType(fieldID);
    int location = gdpicturePDF.GetFormFieldPage(fieldID);
    // Add a new line to the `StringBuilder` with the form field data.
    String[] newLine = { fieldID.ToString(), fieldType.ToString(), location.ToString() };
    data.AppendLine(string.Join(";", newLine));
}
// Save the collected data to a CSV file.
String formData = @"C:\temp\output.csv";
File.AppendAllText(formData, data.ToString());

```

### VB.NET

```vb

Using gdpicturePDF As GdPicturePDF = New GdPicturePDF()
    ' Create a `StringBuilder` variable to store data.
    Dim data As StringBuilder = New StringBuilder()
    ' Add headers to the first line.
    Dim headers = {"Field ID", "Field Type", "Field Location Page"}
    data.AppendLine(String.Join(";", headers))

    gdpicturePDF.LoadFromFile("C:\temp\source.pdf")
    ' Get the form field count.
    Dim fieldCount As Integer = gdpicturePDF.GetFormFieldsCount()
    ' Loop through all form fields.
    For i = 0 To fieldCount - 1
        ' Get the field ID, type, and page location of each form field.
        Dim fieldID As Integer = gdpicturePDF.GetFormFieldId(i)
        Dim fieldType As PdfFormFieldType = gdpicturePDF.GetFormFieldType(fieldID)
        Dim location As Integer = gdpicturePDF.GetFormFieldPage(fieldID)
        ' Add a new line to the `StringBuilder` with the form field data.
        Dim newLine As String() = {fieldID.ToString(), fieldType.ToString(), location.ToString()}
        data.AppendLine(String.Join(";", newLine))
    Next
    ' Save the collected data to a CSV file.
    Dim formData = "C:\temp\output.csv"
    File.AppendAllText(formData, data.ToString())
End Using

```

#### Used methods

- [`GetFormFieldId`](/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~GetFormFieldId.html)

- [`GetFormFieldsCount`](https://www.nutrient.io/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~GetFormFieldsCount.html)

- [`GetFormFieldPage`](/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~GetFormFieldPage.html)

- [`GetFormFieldType`](/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~GetFormFieldType.html)

- [`LoadFromFile`](/api/gdpicture/GdPicture.NET.14.API~GdPicture14.GdPicturePDF~LoadFromFile.html)

#### Related topics

- [Load a file](/guides/dotnet/load-a-file.md)
---

## Related pages

- [Flatten PDF form fields in C# .NET](/guides/dotnet/forms/flatten.md)
- [PDF forms in C#.NET](/guides/dotnet/forms.md)
- [Read PDF form fields in C# .NET](/guides/dotnet/forms/read-form-fields.md)
- [PDF form field items in C# .NET](/guides/dotnet/forms/form-field-items.md)
- [Introduction to PDF forms in C#](/guides/dotnet/forms/introduction-what-are-forms.md)
- [Introduction to PDF form fields in C#](/guides/dotnet/forms/introduction-form-fields.md)
- [Add PDF actions to forms using C#](/guides/dotnet/forms/pdf-actions-support.md)