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Convert the PDF file into base64 string and pass it to the webbrowser control
if (locateText.Text.EndsWith("pdf", true, null) == true &&
File.Exists(locateText.Text) == true)
{
var buffer = File.ReadAllBytes(locateText.Text);
// Document.InvokeScript seems not understanding the Blob type
//object[] args = { fileBytes };
//webBrowser1.Document.InvokeScript("PDFViewerApplication.open", args);
// so convert it to base64 and pass it
var asBase64 = Convert.ToBase64String(buffer);
webBrowser1.Document.InvokeScript("openPdfAsBase64", new[] { asBase64 });
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