c# - How to send and receive 1024 Bits? -

i'm designing interface using c# windows forms , want send , receive 1024 bits using serial port, number i'm sending in hex-form, did next:

private void button2_click(object sender, eventargs e) {     int i;     int = 0;     byte[] mychar;     mychar = new byte[128];     string m = textbox1.text;      (i = 0; < 127; i++ )     {         mychar[i] = convert.tobyte((m.substring(a,2)),16);         += 2;     }     serialport1.write(mychar,0,127); } 

and check if data correct or not, shorted out both transmitter , receiver can see send textbox1 shown in textbox5, problem textbox shown output ascii, , couldn't tell how convert hex form ,(see attempt commented bellow):

private void displaytext(object s, eventargs e) {     textbox5.clear();     textbox5.appendtext(rxstring);     //int value = convert.toint32(rxstring, 16);     //string stringvalue = char.convertfromutf32(value);     //textbox4.appendtext(stringvalue); } 

so summarize problems: 1- code send data correct? 2- how can force textbox show output hex?

thank much.

update full code, maybe understand problem :

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.windows.forms;  namespace windowsformsapplication1 {     public partial class form3 : form     {         public form3()         {             initializecomponent();         }         string rxstring = "";         private void serialport1_datareceived(object sender, system.io.ports.serialdatareceivedeventargs e)         {             try             {                 rxstring = serialport1.readexisting();                 this.invoke(new eventhandler(displaytext));             }             catch (system.timeoutexception)             {              }         }             private void displaytext(object s, eventargs e)         {              textbox5.clear();              textbox5.appendtext(rxstring);              //int value = convert.toint32(rxstring, 16);              //string stringvalue = char.convertfromutf32(value);              //textbox4.appendtext(stringvalue);         }              private void picturebox2_click(object sender, eventargs e)             {                 serialport1.close();                 form1 myform = new form1();                 this.close();             }              private void button1_click(object sender, eventargs e)             {                 try                 {                     if (!serialport1.isopen)                     {                          serialport1.open();                         button1.enabled = false;                     }                     else                     {                         messagebox.show("port open other party!");                      }                   }                 catch (unauthorizedaccessexception ex)                 {                     messagebox.show(ex.message);                 }             }              private void form3_formclosed(object sender, formclosedeventargs e)             {                 serialport1.close();             }              private void button3_click(object sender, eventargs e)             {                 textbox1.text = "0";                 textbox2.text = "0";                 textbox3.text = "0";                 textbox4.text = "0";                 textbox5.text = "";             }              private void button2_click(object sender, eventargs e)             {                 int i;                 int a=0;                 byte[] mychar;                 mychar = new byte[128];                 string m = textbox1.text;                  (i = 0; < 127; i++ ) {                 mychar[i] = convert.tobyte((m.substring(a,2)),16);                 += 2;                 }                 serialport1.write(mychar,0,127);             }          }     } 

when send data textbox1 want shown send in textbox5, can me in ? https://drive.google.com/file/d/0b5pxkmhwkwqrretumxbazda1luu/view?usp=sharing

this mcve shows how convert between bytes , hexadecimal strings:

class program {     static void main(string[] args) {         byte[] bytes = fromhexstring("0123456789abcef");         string text = tohexstring(bytes);         console.write(text);         console.readkey(true);     }      static byte[] fromhexstring(string hexstring) {         byte[] result;         //determine length , handle case of uneven digit count         int length = hexstring.length / 2;         bool = length * 2 == hexstring.length;         if(!even) {             length++;         }         //allocate memory         result = new byte[length];          int offset;         if(even) {             offset = 0;         } else {             //convert first digit, if digit count uneven              result[0] = convert.tobyte(hexstring[0].tostring(), 16);             offset = 1;         }         for(int = offset; < result.length; i++) {             //convert digit byte             result[i] = convert.tobyte((hexstring.substring(i * 2 - offset, 2)), 16);         }         return result;     }      static string tohexstring(byte[] bytes, bool uppercase = true) {         string format = uppercase ? "x" : "x";         //initialize result double capacity byte in hex notation occupies 2 chars         stringbuilder result = new stringbuilder(bytes.length * 2);         foreach(var @byte in bytes) {             result.append(@byte.tostring(format));         }         return result.tostring();     } }