C#

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using (StreamReader reader = new StreamReader("file.txt"))
{
  string line = null;
  while ((line = reader.ReadLine()) != null)
    // Parse and save 'line' to an XML file.
}

<br />
//CODE TO SIGN THE DOCUMENT<br />
<br />
Microsoft.Web.Services.Security.X509.X509Certificat cert;<br />
		<br />
XmlDocument doc = new XmlDocument();<br />
doc.Load("c:/Formtosign.xml");<br />
		<br />
// Creating the XML signing object.<br />
SignedXml sxml = new SignedXml(doc);<br />
sxml.SigningKey = cert.key; <br />
<br />
// Set the canonicalization method for the document.<br />
sxml.SignedInfo.CanonicalizationMethod =<br />
              SignedXml.XmlDsigCanonicalizationUrl; // No comments.<br />
<br />
// Create an empty reference (not enveloped) for the XPath<br />
// transformation.<br />
Reference r = new Reference("");<br />
<br />
// Create the XPath transform and add it to the reference list.<br />
r.AddTransform(new XmlDsigEnvelopedSignatureTransform(false));<br />
<br />
// Add the reference to the SignedXml object.<br />
sxml.AddReference(r);<br />
<br />
///INSERT THE CERTIFICATE INTO THE SIGNED XML<br />
System.Security.Cryptography.Xml.KeyInfo keyInfo = <br />
               new   System.Security.Cryptography.Xml.KeyInfo(); <br />
	<br />
keyInfo.AddClause(new System.Security.Cryptography.Xml.KeyInfoX509Data(cert)); <br />
sxml.KeyInfo = keyInfo;		<br />
<br />
// Compute the signature.<br />
sxml.ComputeSignature();<br />
<br />
// Get the signature XML and add it to the document element.<br />
XmlElement sig = sxml.GetXml();<br />
doc.DocumentElement.AppendChild(sig);<br />
<br />
// Write-out formatted signed XML to console (allow for redirection).<br />
XmlTextWriter writer = new XmlTextWriter<br />
                 ("c:/Formsigned.xml",System.Text.Encoding.UTF8);<br />
writer.Formatting = Formatting.Indented;<br />
<br />
try<br />
{<br />
doc.WriteTo(writer);<br />
}<br />
finally<br />
{<br />
writer.Flush();<br />
writer.Close();<br />
}<br />

<br />
//CODE TO VERIFY THE SIGNATURE<br />
nodeList = doc.GetElementsByTagName<br />
             ("Signature",SignedXml.XmlDsigNamespaceUrl);<br />
<br />
//GETING THE CERTIFICATE<br />
nodeList2 = doc.GetElementsByTagName("X509Certificate");<br />
				                     <br />
SignedXml[] signatures = new SignedXml[nodeList.Count];<br />
			<br />
validSignatures = nodeList.Count;<br />
<br />
					<br />
for(int i = 0; i < nodeList.Count; i++)<br />
{<br />
	signatures[i] = new SignedXml();<br />
	signatures[i].LoadXml((XmlElement)nodeList[i]);<br />
<br />
<br />
	//I USE CAPICOM BECAUSE LATER I WILL NEED IT TO... <br />
        //...MAKE SOME VERIFICATIONS<br />
        Certificate cerCapi = new CertificateClass();<br />
        cerCapi.Import(nodeList2[i].InnerText);<br />
	ICertContext iCertCntxt = (ICertContext) cerCapi;<br />
	int certcntxt = iCertCntxt.CertContext ;<br />
	IntPtr hCertCntxt = new IntPtr(certcntxt);<br />
<br />
Microsoft.Web.Services.Security.X509.X509Certificate cer = new Microsoft.Web.Services.Security.X509.X509Certificate(hCerCntx);<br />
							<br />
	<br />
	RSACryptoServiceProvider csp = new RSACryptoServiceProvider();<br />
	csp = (RSACryptoServiceProvider)cer.PublicKey;<br />
	if (!signatures[i].CheckSignature(csp))<br />
		validSignatures--;<br />
}<br />