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Timeouts
using IronOcr;

int cancel_time = 1000;

// Opens a Large PDF which may need to be cancelled early
IronTesseract ocrTesseract = new IronTesseract() { Language = OcrLanguage.English };
var ocrInput = new OcrInput();
ocrInput.LoadPdf("large-report.pdf");

// Starts a read on the PDF using IronOCR with specified cancel time
OcrReadTask ocrRead = ocrTesseract.ReadAsync(ocrInput, cancel_time);
ocrRead.Wait();
Imports IronOcr

Dim cancel_time As Integer = 1000

' Opens a Large PDF which may need to be cancelled early
Dim ocrTesseract As New IronTesseract() With {.Language = OcrLanguage.English}
Dim ocrInput = New OcrInput()
ocrInput.LoadPdf("large-report.pdf")

' Starts a read on the PDF using IronOCR with specified cancel time
Dim ocrRead As OcrReadTask = ocrTesseract.ReadAsync(ocrInput, cancel_time)
ocrRead.Wait()
NuGet Download
PM > Install-Package IronOcr
Timeouts

Timeouts

The millisecond timeout parameter of the ReadAsync method provides an optional timeout in milliseconds, after which the OCR read operation will be canceled.

Similar to using a CancellationToken, the ReadAsync timeout parameter also helps with reading large input files in case the program or application becomes stuck.

Please note that the feature is not supported in .NET Framework 4.x.x.

Explore Async OCR Handling with IronOCR in C#
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C# NuGet Library for PDF
Install with NuGet

Version: 2026.10

PM > Install-Package IronOcr
nuget.org/packages/IronOcr/
  1. In Solution Explorer, right-click References, Manage NuGet Packages
  2. Select Browse and search "IronOCR"
  3. Select the package and install
C# PDF DLL
Download DLL

Version: 2026.10

or download Windows Installer here.

  1. Download and unzip IronOCR to a location such as ~/Libs within your Solution directory
  2. In Visual Studio Solution Explorer, right click References. Select Browse, "IronOCR.dll"

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