Xmldsig Countersignature DigestValue

Hi!
How can i calculate DigestValue for Reference to signature ( ...
uri="#signatureId" ...)?
I try this code:

xmlElement - signature from xml file;
SignedXml signature = new SignedXml();
signature.LoadXml((XmlElement)xmlElement);
Transform t = new
System.Security.Cryptography.Xml.XmlDsigC14NTransform();
XmlDocument doc = new XmlDocument();
doc.PreserveWhitespace = true;
doc.LoadXml(signature.GetXml().OuterXml);
System.IO.Stream s = null;
t.LoadInput(doc);
SHA1 sha1 = SHA1.Create();
byte[] digestValue = t.GetDigestedOutput(sha1);
MessageBox.Show(Convert.ToBase64String(digestValue));

Calculated digestValue is not the same, which is in reference
digestValue in countersignature after signing.
Can anyone help me calculate this digestValue?
Iguana

.

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