public class SignedXml {
// Public Constructors
   public SignedXml(  );
   public SignedXml(System.Xml.XmlDocument document);
   public SignedXml(System.Xml.XmlElement elem);
// Public Static Fields
   public const string XmlDsigCanonicalizationUrl;
// =http://www.w3.org/TR/2001/REC-xml-c14n-20010315
   public const string XmlDsigCanonicalizationWithCommentsUrl;
// =http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments
   public const string XmlDsigDSAUrl;
// =http://www.w3.org/2000/09/xmldsig#dsa-sha1
   public const string XmlDsigHMACSHA1Url;    
// =http://www.w3.org/2000/09/xmldsig#hmac-sha1
   public const string XmlDsigMinimalCanonicalizationUrl;  
// =http://www.w3.org/2000/09/xmldsig#minimal
   public const string XmlDsigNamespaceUrl;   
// =http://www.w3.org/2000/09/xmldsig#
   public const string XmlDsigRSASHA1Url;     
// =http://www.w3.org/2000/09/xmldsig#rsa-sha1
   public const string XmlDsigSHA1Url; 
// =http://www.w3.org/2000/09/xmldsig#sha1
// Protected Instance Fields
   protected Signature m_signature;
   protected string m_strSigningKeyName;
// Public Instance Properties
   public KeyInfo KeyInfo{set; get; }
   public XmlResolver Resolver{set; }
   public Signature Signature{get; }
   public string SignatureLength{get; }
   public string SignatureMethod{get; }
   public byte[  ] SignatureValue{get; }
   public SignedInfo SignedInfo{get; }
   public AsymmetricAlgorithm SigningKey{set; get; }
   public string SigningKeyName{set; get; }
// Public Instance Methods
   public void AddObject(DataObject dataObject);
   public void AddReference(Reference reference);
   public bool CheckSignature(  );
   public bool CheckSignature(System.Security.Cryptography.AsymmetricAlgorithm key);
   public bool CheckSignature(System.Security.Cryptography.KeyedHashAlgorithm macAlg);
   public bool CheckSignatureReturningKey(out System.Security.Cryptography.AsymmetricAlgorithm signingKey);
   public void ComputeSignature(  );
   public void ComputeSignature(System.Security.Cryptography.KeyedHashAlgorithm macAlg);
   public virtual XmlElement GetIdElement(System.Xml.XmlDocument document, string idValue);
   public XmlElement GetXml(  );
   public void LoadXml(System.Xml.XmlElement value);
// Protected Instance Methods
   protected virtual AsymmetricAlgorithm GetPublicKey(  );
}

The SignedXml class is the principle class used to create and verify XML signatures. References to data are associated with a signature document through the AddReference( ) method, while data objects are associated through the AddObject( ) method. The ComputeSignature( ) method performs a signature operation, while the CheckSignature( ) method verifies an existing XML Signature.