How to received data from microcontroller in C++/cli using command line

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C++/CLI

VisualC++

C++11

, +

i am trying to read and Write the data from microcontroller to c++/cli application using protocol . Write data were successfully done but i am unable to received the data.

What I have tried:

private: System::Void main_form_Load(System::Object^ sender, System::EventArgs^ e)
   {
	serialPort1->PortName = "COM5";
	serialPort1->BaudRate = 9600;
	serialPort1->DtrEnable = true;
		
   }
private: System::Void ReadDatabtn_Click(System::Object^ sender, System::EventArgs^ e)
{
	
		      serialPort1->DataReceived += gcnew SerialDataReceivedEventHandler( SP_DataReceived);
		    serialPort1->Open();
			commentbox->Text = "Read OK";
			commentbox->BackColor = Color::Green;
            serialPort1->Close();
	       
	}
 private:static void SP_DataReceived(Object^ sender, SerialDataReceivedEventArgs^ e)
		  {
			 SerialPort^ sp = (SerialPort^)sender;
             String^ start = "\x52\x4c\x53\x73\x64\r\n\r\n";//Read start command
			String^ end = "\x52\x4c\x45\x73\x64\r\n\r\n";//Read End command
			sp->ReadTimeout = 2000;

			  try
			  {
                  sp->Write(start );
                  Thread::Sleep(100);
				  String^ str = sp->ReadExisting();
				  Console::Write("dataReceived ",str +"\n");
                  Thread::Sleep(100);
			      sp->Write(end);
				  
			  }
			  catch (Exception^ ex)
			  {
				  Console::Write("data_received Error");
				 // MessageBox::Show("s");
			  }
		  }
private: System::Void Sendbtn_Click(System::Object^ sender, System::EventArgs^ e)
{
		{
			   serialPort1->Open();
			{
				String^ data = "\x57\x54\x53\x73\x64\r\n\r\n";//Write start command
				String^ data1 = "\x57\x54\x45\x73\x64\r\n\r\n";/write end command
				Clockw->Text = "20220809145722";
				serialPort1->Write(data);
				Thread::Sleep(10);
				 serialPort1->Write(Clockw->Text);
				 Console::Write(Clockw->Text);
				Thread::Sleep(10);
				serialPort1->Write(data1);
				commentbox->Text = "Date Write OK";
				commentbox->BackColor = Color::Green;

			}
			serialPort1->Close();
		}

		
		
}