How to Extract PDF Form Field Data in Bulk Using C# and Free Spire.PDF

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Enterprise workflows frequently rely on PDF forms for data collection, requiring automated extraction of field values for storage and processing. A tutorial on DEV Community demonstrates how to read interactive PDF form fields — including text boxes, checkboxes, radio buttons, list boxes, and combo boxes — using C#. The approach uses the free Spire.PDF for .NET library, which provides the PdfFormWidget class to access and iterate over all form fields in a document. Developers can install the library via NuGet and retrieve field values by casting each field to its specific widget type. The guide also notes limitations such as the free version's 10-page cap and the need for separate handling of XFA-based PDF forms.

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