System.Security.Cryptography.CryptoStream.Read C# (CSharp) Method

        public override int Read(byte[] buffer, int offset, int count)
        {
            CheckReadArguments(buffer, offset, count);
            return ReadAsyncCore(buffer, offset, count, default(CancellationToken), useAsync: false).ConfigureAwait(false).GetAwaiter().GetResult();
        }

 public string Decrypt(string strEncryptedText)
 {
     if (strEncryptedText == null || strEncryptedText.Equals(""))
         return strEncryptedText;
     string strDecryptedText = null;
     RijndaelManaged rijndael = new RijndaelManaged();
     ICryptoTransform decryptor = rijndael.CreateDecryptor(Key, IV);
     byte[] byteEncryptedText = Convert.FromBase64String(strEncryptedText);
     MemoryStream memStream = new MemoryStream(byteEncryptedText);
     CryptoStream decryptStream = null;
     try
     {
         decryptStream = new CryptoStream(memStream, decryptor, CryptoStreamMode.Read);
         byte[] byteDecryptedText = new byte[byteEncryptedText.Length];
         int decryptedByteCount = decryptStream.Read(byteDecryptedText, 0, byteDecryptedText.Length);
         strDecryptedText = Encoding.UTF8.GetString(byteDecryptedText, 0, decryptedByteCount);
     }
     finally
     {
         if (rijndael != null) rijndael.Clear();
         if (decryptor != null) decryptor.Dispose();
         if (memStream != null) memStream.Close();
         if (decryptStream != null) decryptStream.Close();
     }
     if (UseSalt)
         strDecryptedText = strDecryptedText.Substring(8);
     return strDecryptedText;
 }