how can I receive messages (line by line) through serial port from microcontroller by received event like hyperterminal?

#pragma once

namespace WindowsFormsApplication1 {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;
    using namespace System::IO::Ports;

    /// <summary>
    /// Summary for Form1
    /// </summary>
    public ref class Form1 : public System::Windows::Forms::Form
    {
        //delegate void SetTextCallback(String^ text);
        String^ data1;
        //delegate void SetTextCallback(System::Object^ sender, System::EventArgs^ e);
        // create a delegte
        //delegate void invokeDelegate();  // no parameter passing

    public:
        Form1(void)
        {
            InitializeComponent();
            findPorts();

            //
            //TODO: Add the constructor code here
            //
        }

    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~Form1()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::IO::Ports::SerialPort^  serialPort1;
    protected:
    private: System::Windows::Forms::ComboBox^  comboBox1;
    private: System::Windows::Forms::Label^  label1;
    private: System::Windows::Forms::Label^  label2;
    private: System::Windows::Forms::ComboBox^  comboBox2;
    private: System::Windows::Forms::Button^  button1;
    private: System::Windows::Forms::Button^  button2;
    private: System::Windows::Forms::TextBox^  textBox1;

    private: System::Windows::Forms::ProgressBar^  progressBar1;
    private: System::Windows::Forms::Label^  label3;
    private: System::ComponentModel::IContainer^  components;

    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>


#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->components = (gcnew System::ComponentModel::Container());
            this->serialPort1 = (gcnew System::IO::Ports::SerialPort(this->components));
            this->comboBox1 = (gcnew System::Windows::Forms::ComboBox());
            this->label1 = (gcnew System::Windows::Forms::Label());
            this->label2 = (gcnew System::Windows::Forms::Label());
            this->comboBox2 = (gcnew System::Windows::Forms::ComboBox());
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->button2 = (gcnew System::Windows::Forms::Button());
            this->textBox1 = (gcnew System::Windows::Forms::TextBox());
            this->progressBar1 = (gcnew System::Windows::Forms::ProgressBar());
            this->label3 = (gcnew System::Windows::Forms::Label());
            this->SuspendLayout();
            //
            // serialPort1
            //
            this->serialPort1->DataReceived += gcnew System::IO::Ports::SerialDataReceivedEventHandler(this, &Form1::serialPort1_DataReceived);
            //
            // comboBox1
            //
            this->comboBox1->FormattingEnabled = true;
            this->comboBox1->Location = System::Drawing::Point(212, 16);
            this->comboBox1->Name = L"comboBox1";
            this->comboBox1->Size = System::Drawing::Size(121, 21);
            this->comboBox1->TabIndex = 0;
            //
            // label1
            //
            this->label1->AutoSize = true;
            this->label1->Location = System::Drawing::Point(148, 20);
            this->label1->Name = L"label1";
            this->label1->Size = System::Drawing::Size(58, 13);
            this->label1->TabIndex = 1;
            this->label1->Text = L"COM Ports";
            //
            // label2
            //
            this->label2->AutoSize = true;
            this->label2->Location = System::Drawing::Point(148, 47);
            this->label2->Name = L"label2";
            this->label2->Size = System::Drawing::Size(58, 13);
            this->label2->TabIndex = 2;
            this->label2->Text = L"Baud Rate";
            //
            // comboBox2
            //
            this->comboBox2->FormattingEnabled = true;
            this->comboBox2->Items->AddRange(gcnew cli::array< System::Object^  >(1) {L"9600"});
            this->comboBox2->Location = System::Drawing::Point(212, 44);
            this->comboBox2->Name = L"comboBox2";
            this->comboBox2->Size = System::Drawing::Size(121, 21);
            this->comboBox2->TabIndex = 3;
            //
            // button1
            //
            this->button1->Location = System::Drawing::Point(26, 10);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(75, 23);
            this->button1->TabIndex = 4;
            this->button1->Text = L"Initialize Port";
            this->button1->UseVisualStyleBackColor = true;
            this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
            //
            // button2
            //
            this->button2->Location = System::Drawing::Point(26, 42);
            this->button2->Name = L"button2";
            this->button2->Size = System::Drawing::Size(75, 23);
            this->button2->TabIndex = 5;
            this->button2->Text = L"Close Port";
            this->button2->UseVisualStyleBackColor = true;
            this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
            //
            // textBox1
            //
            this->textBox1->Enabled = false;
            this->textBox1->Location = System::Drawing::Point(12, 87);
            this->textBox1->Multiline = true;
            this->textBox1->Name = L"textBox1";
            this->textBox1->ReadOnly = true;
            this->textBox1->ScrollBars = System::Windows::Forms::ScrollBars::Vertical;
            this->textBox1->Size = System::Drawing::Size(447, 163);
            this->textBox1->TabIndex = 6;
            //
            // progressBar1
            //
            this->progressBar1->Location = System::Drawing::Point(359, 39);
            this->progressBar1->Name = L"progressBar1";
            this->progressBar1->Size = System::Drawing::Size(100, 23);
            this->progressBar1->TabIndex = 8;
            //
            // label3
            //
            this->label3->AutoSize = true;
            this->label3->Location = System::Drawing::Point(359, 19);
            this->label3->Name = L"label3";
            this->label3->Size = System::Drawing::Size(63, 13);
            this->label3->TabIndex = 9;
            this->label3->Text = L"Port STatus";
            //
            // Form1
            //
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(471, 262);
            this->Controls->Add(this->comboBox2);
            this->Controls->Add(this->label2);
            this->Controls->Add(this->comboBox1);
            this->Controls->Add(this->label1);
            this->Controls->Add(this->label3);
            this->Controls->Add(this->progressBar1);
            this->Controls->Add(this->textBox1);
            this->Controls->Add(this->button2);
            this->Controls->Add(this->button1);
            this->Name = L"Form1";
            this->Text = L"Form1";
            this->ResumeLayout(false);
            this->PerformLayout();

        }
#pragma endregion

        //find serial available ports
         private: void findPorts(void)
          {
         // get port names
          array<Object^>^ objectArray = SerialPort::GetPortNames();
         // add string array to combobox
         this->comboBox1->Items->AddRange( objectArray );

          }

    //init button
    private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

            this->textBox1->Text=String::Empty;
            if(this->comboBox1->Text==String::Empty || this->comboBox2->Text==String::Empty)
               this->textBox1->Text="Please Select Port Settings";
            else {
               try{
                  // make sure port isn't open
               if(!this->serialPort1->IsOpen){
                  this->serialPort1->PortName=this->comboBox1->Text;
                  this->serialPort1->BaudRate=Int32::Parse(this->comboBox2->Text);
                  //this->textBox1->Text="Enter Message Here";
                //open serial port
                  this->serialPort1->Open();
                  this->progressBar1->Value=100;
                  this->button1->Enabled = false;
               }
               else
                  this->textBox1->Text="Port isn't openned";
               }
               catch(UnauthorizedAccessException^){
                  this->textBox1->Text="UnauthorizedAccess";
               }
             }
}
             //close button
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
             //close serialPort
             this->serialPort1->Close();
             // update progress bar
             this->progressBar1->Value=0;
             // Enable read button
             //this->button2->Enabled = true;
             // Enable the init button
             this->button1->Enabled = true;
             // ovalShape
             //this->ovalShape1->FillColor= Color::Red;

         }


private: System::Void serialPort1_DataReceived(System::Object^  sender, System::IO::Ports::SerialDataReceivedEventArgs^  e) {
                 data1 = serialPort1->ReadExisting();
                 textBox1->Text = textBox1->Text + data1 + "\r\n";
                 this->Invoke(gcnew EventHandler(this, &Form1::SetTextCallback));
                 //this->BeginInvoke( gcnew invokeDelegate( this, &Form1::SetTextCallback));
             }

private: System::Void SetTextCallback(System::Object^ sender, System::EventArgs^ e)
         {
                this->textBox1->AppendText(data1);
                //this->textBox1->Text=data1;
                //this->textBox1->Text="test";
         }

};
}