RSA Encryption error

See more:

C#

encryption

Hi,

I have generated a key in XML format:

RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
string RSAXml = RSA.ToXmlString(true);

After having the key i used this key to SIGN the data as below:

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
rsa.FromXmlString(RSAXml);
byte[] DataToSign = Encoding.UTF8.GetBytes("Some Date");
byte[] signByte = rsa.SignData(DataToSign, new SHA1CryptoServiceProvider());
string encodedDititalSign = Convert.ToBase64String(signByte);

The above code show error on line:
byte[] signByte = rsa.SignData(DataToSign, new SHA1CryptoServiceProvider());

Error Message:

---Keyset does not exist <br />
-mscorlib<br />

Please guide, how to resolve this issue.