test.cshtml

@model ClaimView

@using TXTextControl.Web.MVC.DocumentViewer

<div style="width: 100%; height: 600px;">

	@Html.TXTextControl().DocumentViewer(settings => {
		settings.DocumentData = Convert.ToBase64String(Model.Document);
		settings.Dock = DocumentViewerSettings.DockStyle.Fill;
		settings.SignatureSettings = new SignatureSettings() {
			OwnerName = "Happy Insurance",
			SignerName = Model.Claim.name,
			SignatureBoxes = new SignatureBox[] {
				new SignatureBox("txsign") {
					SigningRequired = true,
					Style = SignatureBox.SignatureBoxStyle.Signature }},
			ShowSignatureBar = true,
			RedirectUrlAfterSignature = this.Url.Action(
				"ExportPDF",
				"Home",
				null,
				Context.Request.Scheme, Context.Request.Host.ToString())
		};
	}).Render()

</div>

<script>
	window.addEventListener("documentViewerLoaded", function () {
		TXDocumentViewer.signatures.setSubmitCallback(exportPDF);
	});
	function exportPDF(data) {
		// create temporary link to download document
		var element = document.createElement('a');
		element.setAttribute('href', 'data:application/octet-stream;base64,' + data);
		element.setAttribute('download', "result.pdf");
		element.style.display = 'none';
		document.body.appendChild(element);
		// simulate click
		element.click();
		// remove the link
		document.body.removeChild(element);
	}
</script>