Encryption decryption problem

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C#

Hi following are Two functions one is for encryption and another for decryption.When i send English buffer to EncryptBufW then it encrypt it and function DecryptBufw can decrypt it.But when i pass Hindi text then it encrypted but not decrypted by DecryptBuff function.it returns "" in out parameter.

public int EncryptBuffW(string InDec_buffer, out string OutEnc_buffer, out int OutEnc_bSize)
       {
           OutEnc_buffer = "";
           OutEnc_bSize = 0;
           string OutData = "";
           CryptoStream encStream = null;
           MemoryStream fin = null;
           MemoryStream fout = new MemoryStream();

           try
           {
               try
               {
                   byte[] data = Encoding.Unicode.GetBytes(InDec_buffer);
                   //Create the file streams to handle the input and output files.
                   fin = new MemoryStream(data);
                   //Create variables to help with read and write.

                   byte[] bin = new byte[bufLen]; //This is intermediate storage for the encryption.

                   long rdlen = 0; //This is the total number of bytes written.

                   long totlen = fin.Length; //This is the total length of the input file.

                   int len; //This is the number of bytes to be written at a time.

                   RijndaelManaged rijn = new RijndaelManaged();

                   rijn.Mode = CipherMode.CBC;
                   rijn.KeySize = 256;
                   rijn.BlockSize = 128;
                   rijn.Padding = PaddingMode.PKCS7;

                   encStream = new CryptoStream(fout, rijn.CreateEncryptor(cryptoKey, cryptoIV), CryptoStreamMode.Write);

                   //Read from the input file, then encrypt and write to the output file.

                   while (true)
                   {

                       len = fin.Read(bin, 0, bufLen);

                       if (len == 0)

                           break;

                       encStream.Write(bin, 0, len);

                       rdlen += len;


                   }
                   encStream.FlushFinalBlock();
                   OutEnc_buffer = Encoding.Unicode.GetString(fout.ToArray());
                   /* StreamWriter wr = new StreamWriter("c:\\fff.txt", true, Encoding.Unicode);
                    wr.Write(OutEnc_buffer);
                    wr.Close();*/

               }
               catch (Exception e)
               {
                   if (logPermission)
                   {
                       SetErrLogFileName("EncryptBuffW:" + " Exception Details: " + e.Message);
                   }
                   return 1;
               }

               finally
               {

                   if (encStream != null)

                       encStream.Close();

                   if (fout != null)

                       fout.Close();

                   if (fin != null)

                       fin.Close();

               }
           }
           catch (Exception ee)
           {
               if (logPermission)
               {
                   SetErrLogFileName("EncryptBuffW:" + " Exception Details: " + ee.Message);
               }
               return 1;
           }

           OutEnc_bSize = OutEnc_buffer.Length;
           return 0;
       }


public int DecryptBuffW(string InEnc_buffer, int InEnc_bSize, out string OutDec_buffer)
       {
           OutDec_buffer = "";
           InEnc_bSize = 0;
           string OutData = "";
           CryptoStream encStream = null;
           MemoryStream fin = null;
           MemoryStream fout = new MemoryStream();
           try
           {
               try
               {
                   byte[] data = Encoding.Unicode.GetBytes(InEnc_buffer);
                   //Create the file streams to handle the input and output files.
                   fin = new MemoryStream(data);
                   //Create variables to help with read and write.

                   byte[] bin = new byte[bufLen]; //This is intermediate storage for the encryption.

                   long rdlen = 0; //This is the total number of bytes written.

                   long totlen = fin.Length; //This is the total length of the input file.

                   int len; //This is the number of bytes to be written at a time.

                   RijndaelManaged rijn = new RijndaelManaged();

                   rijn.Mode = CipherMode.CBC;
                   rijn.KeySize = 256;
                   rijn.BlockSize = 128;
                   rijn.Padding = PaddingMode.PKCS7;

                   encStream = new CryptoStream(fout, rijn.CreateDecryptor(cryptoKey, cryptoIV), CryptoStreamMode.Write);

                   //Read from the input file, then encrypt and write to the output file.

                   while (true)
                   {

                       len = fin.Read(bin, 0, bufLen);

                       if (len == 0)

                           break;

                       encStream.Write(bin, 0, len);

                       rdlen += len;


                   }
                   encStream.FlushFinalBlock();
                   OutDec_buffer = Encoding.Unicode.GetString(fout.ToArray());
                   /*StreamWriter wr = new StreamWriter("c:\\fff.txt",true,Encoding.Default);
                   wr.Write(OutEnc_buffer);
                   wr.Close();*/

               }
               catch (Exception e)
               {
                   if (logPermission)
                   {
                       SetErrLogFileName("DecryptBuffW:" + " Exception Details: " + e.Message);
                   }
                   return 1;
               }

               finally
               {

                   if (encStream != null)

                       encStream.Close();

                   if (fout != null)

                       fout.Close();

                   if (fin != null)

                       fin.Close();

               }
           }
           catch (Exception ee)
           {
               if (logPermission)
               {
                   SetErrLogFileName("DecryptBuffW:" + " Exception Details: " + ee.Message);
               }
               return 1;
           }

           InEnc_bSize = OutDec_buffer.Length;

           return 0;
       }