Problem in 3DES decryption using CBC cipher mode

[Sathyaish]

I am using CBC as the cipher mode to decrypt some text I'd encrypted
using the same mode for 3DES algorithm. My decrypt does not return the
correct result because the TransformBlock method returns 0 as bytes
read. Here's my code:

public static string Decrypt(string seed)
{
System.IO.MemoryStream stream = new System.IO.MemoryStream();

TripleDESCryptoServiceProvider TripleDESProvider = new
TripleDESCryptoServiceProvider();
TripleDESProvider.Key = new
System.Text.ASCIIEncoding().GetBytes(ComputeHash(N ativeEncryptionKey));
TripleDESProvider.Mode = CipherMode.CBC;
ICryptoTransform Decryptor = TripleDESProvider.CreateDecryptor();
byte[] bSeed = new System.Text.ASCIIEncoding().GetBytes(seed);

int numBlocks = (int)(bSeed.Length / TripleDESProvider.IV.Length);
int finalBlockSize = (int) (bSeed.Length %
TripleDESProvider.IV.Length);
int pos = 0;
byte[] btmp;

for (int i = 0; i < numBlocks; i++)
{
btmp = new byte[TripleDESProvider.IV.Length];
int bytesRead = Decryptor.TransformBlock(bSeed, i *
TripleDESProvider.IV.Length, TripleDESProvider.IV.Length, btmp, 0);
stream.Write(btmp, 0, btmp.Length);
pos += btmp.Length;
}

if (finalBlockSize 0)
{
btmp = null;
int bytesRead = numBlocks * TripleDESProvider.IV.Length;
btmp = Decryptor.TransformFinalBlock(bSeed, pos, finalBlockSize);
if (btmp.Length 0)
stream.Write(btmp, 0, btmp.Length);
}
Decryptor = null;
bSeed = null;
TripleDESProvider = null;

return new System.Text.ASCIIEncoding().GetString(stream.ToArr ay());
}
Anyone?