Encrypt a file using RSA Algorythm

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C#

Hello Experts,

I made one small desktop application in C#.net. My requirement is i want to encrypt a text file using RSA Algorithm. I already done this encyption using CAPICOMM.dll, but now I want to do it using RSA Algorithm in which I will use Public key to encrypt the file and Private key to decrypt the encrypted file.

Below is my code that I implemented but it gives me an error!!:confused:

UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] dataToEncrypt = ByteConverter.GetBytes("Hello there");
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
//CspParameters param = new CspParameters(
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
    //Pass the data to ENCRYPT, the public key information
    RSA.FromXmlString(SelectedCertificate.PublicKey.Key.ToXmlString(false));
    encryptedData = RSA.Encrypt(dataToEncrypt, false);
    //Pass the data to DECRYPT, the private key information
    RSA.FromXmlString(SelectedCertificate.PrivateKey.ToXmlString(false));
    decryptedData = RSA.Decrypt(encryptedData, false);
    //Display the decrypted plaintext
}

Need your suggestion. Thanks in advance...

[edit]Tags, minor spelling - OriginalGriff[/edit]