How to Convert Scanned PDF to Searchable PDF in C# .NET

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You can read more details at: Convert Scanned PDF to Searchable PDF with OCR in C#

Scanned PDF to Searchable PDF csharp.cs

// Scanned multipage PDF Path
string fullPath = "multi_page.pdf";

// Initialize AsposeOcr class object
AsposeOcr api = new AsposeOcr();

// Recognize images from PDF           
List<RecognitionResult> res = api.RecognizePdf(fullPath, new DocumentRecognitionSettings
{
    StartPage = 0,
    PagesNumber = 1
});

// Save result as Searchable PDF
AsposeOcr.SaveMultipageDocument("output.pdf", SaveFormat.Pdf, res);