how to verify signed data in .NET 2.0?

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C#

Hi
My client has signed the xml in Java using private key & IAIK tool. I want to decrypt/verify the data in .NET 2.0. I have public certificate of my client. I have tried various methods but verification fails. Kindly suggest any code to verify/decrypt the data. The signed XML is as follows

<TrnResponse>
 <Transaction>
  <Type>TrnResponse</MessageType>
  <ReferenceNo>123456</ReferenceNo>
  <ClientName>ABCDI</ClientName>
  <TReferenceNo>111111</CTReferenceNo>
  <Mode>05</Mode>
  <Status>SUCCESSFUL</Status>
  <TRXDateTime>06-03-2012 13:16:21</TRXDateTime>
  <TRXID>001111222</TRXID>
  </Transaction>
 <Signature>  <SignatureValue>MIAGCSqGSIb3DQEHAqCAMIIHlwIBATELMAkGBSsOAwIaBQAwCwYJKoZIhvcNAQcB</SignatureValue>
  </Signature>
</TrnResponse>

i am trying following code to verify

XmlDocument Doc = new XmlDocument();
        Doc.PreserveWhitespace = false;
        Doc.Load(@"d:\data.xml");
        SignedXml signedXml = new SignedXml(Doc);
        XmlNodeList nodeList = Doc.GetElementsByTagName("Signature");

        X509Certificate2 cert = GetRecipientCert(); // method returns public certificate
        RSACryptoServiceProvider csp = (RSACryptoServiceProvider)cert.PublicKey.Key;

        string publickey = cert.PublicKey.Key.ToXmlString(false);

        XmlNodeList xn1 = Doc.GetElementsByTagName("Transaction");
        string license_code = xn1.Item(0).OuterXml.ToString();
        ASCIIEncoding ByteConverter = new ASCIIEncoding();
        byte[] verify_this = ByteConverter.GetBytes(license_code);
        string base64_encoded_signature = Doc.GetElementsByTagName("SignatureValue").Item(0).InnerText;
        byte[] signature = Convert.FromBase64String(base64_encoded_signature);
        bool ok = csp.VerifyData(verify_this, new SHA1CryptoServiceProvider(), signature);