Encrypt in c and decrypt in c#

void main()
{
 CRijndael oRijndael;
  oRijndael.MakeKey("512345678901234561234567890123456", CRijndael::sm_chain0,32,16);
  char szDataIn1[49] = "sunil pol";
  char szDataIn[49];
  char szDataOut[49];
  memset(szDataIn, 0, 49);
  memset(szDataOut, 0, 49);

  //Test ECB
  strcpy(szDataIn, szDataIn1);
  memset(szDataOut, 0, 49);
  oRijndael.Encrypt(szDataIn, szDataOut, 48, CRijndael::ECB);
  cout << szDataOut << endl;
  FILE *fp =NULL ;
 fp = fopen("F:\\Encoding and Decoding\\CEncrypt.txt","ab+") ;
 fwrite(szDataOut,strlen(szDataOut),1,fp);
 fclose(fp) ;
  memset(szDataIn, 0, 49);
  oRijndael.Decrypt(szDataOut, szDataIn, 48, CRijndael::ECB);
  cout << szDataIn << endl;*/

}

public static void Decrypt()
        {
            string password = @"512345678901234561234567890123456"; //Your Key Here

            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, new byte[] { 0x26, 0xdc, 0xff, 0x00, 0xad, 0xed, 0x7a, 0xee, 0xc5, 0xfe, 0x07, 0xaf, 0x4d, 0x08, 0x22, 0x3c });

            FileStream fsCrypt = new FileStream(@"F:\Encoding and Decoding\CEncrypt.txt", FileMode.Open);

            RijndaelManaged RMCrypto = new RijndaelManaged();
            RMCrypto.Mode=CipherMode.ECB;
            RMCrypto.Padding = PaddingMode.None;
            RMCrypto.KeySize = 256;
            RMCrypto.BlockSize = 128;
            
            byte[] key = pdb.GetBytes(RMCrypto.KeySize / 8);
            byte[] iv = pdb.GetBytes(RMCrypto.BlockSize /8);         

            CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateDecryptor(key, iv), CryptoStreamMode.Read);
         //   CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateDecryptor(), CryptoStreamMode.Read);


            FileStream fsOut = new FileStream(@"F:\Encoding and Decoding\ReadMe_Decrypted.txt", FileMode.Create);

            int data;
            while ((data = cs.ReadByte()) != -1)
                fsOut.WriteByte((byte)data);

            fsOut.Close();
            cs.Close();
            fsCrypt.Close();
        }