The server can not receive encryptedtext by rsa in client/server application

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C#

I am using RSA to encrypted text and then send the encryptedtext to server ,My problem is the server unable to decrypted text because the server can not read encryptedtext correct , my code in client is :

byte[] plaintext;
            byte[] encryptedtext=new byte[128];
            plaintext = ByteConverter.GetBytes("hello");
            encryptedtext = Encryption(plaintext, RSAA.ExportParameters(false), false);
            textBox10.Text = ByteConverter.GetString(encryptedtext);

          byte[] bytesToSend = ASCIIEncoding.ASCII.GetBytes(textBox10.Text);
          networkStream.Write(bytesToSend, 0, bytesToSend.Length);

my code in server :

byte[] buffer = new byte[handlerSocket.ReceiveBufferSize];
 dataReceived = Encoding.ASCII.GetString(buffer, 0, buffer.Length);
            byte[] encryptedtext=new byte[128] ;
         //   dataReceived = ByteConverter.GetBytes(dataReceived);
            encryptedtext = ByteConverter.GetBytes(dataReceived);
            byte[] decryptedtex = Decryption(encryptedtext, RSA.ExportParameters(true), false);
               if(decryptedtex!=null)
            textBox4.Text = ByteConverter.GetString(decryptedtex);

output :

in client the encrypted text : 卅凉䂧즠淦燺◓㎜ზﾷ큺�㬧ᶥ숿둴ꖉ␽넵Տ懾쵌摘䙑원퀮歒�숈鬖姈㫑餓貜Dž手葏㻐㺿⣨ꇑ橿朁繱�䘧殍㲙㦱䟽躮Ồᒛ鈉嫡짟

but when the encrypted text recive to server is : ????????????????????????????????????????????????????????? and the server can not Decryption the text

so How I can solve this problem ?

What I have tried:

my code in my question can any body help ? thanks in advance