Managed C++/CLI

System::Windows::Forms::OpenFileDialog^ MyFileOpenDialog = gcnew System::Windows::Forms::OpenFileDialog();
MyFileOpenDialog->Title = "Select Your Excel Test File";
MyFileOpenDialog->InitialDirectory = "C:\\";
MyFileOpenDialog->Filter = "Excel Files (*.xls)|*.xls|All files (*.*)|*.*";
MyFileOpenDialog->FilterIndex = 2;
MyFileOpenDialog->RestoreDirectory = true;
if (MyFileOpenDialog->ShowDialog() == System::Windows::Forms::DialogResult::OK) {
    MyExcelFile = MyFileOpenDialog->FileName;
}

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

List<System::Byte>^ temp

temp = My1DArray.ToList(); //doesn't work

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

int^ bytesToRead = gcnew(int);
*bytesToRead = SerialPort->BytesToRead;
SerialPort->Read(My1DArray, 0, *bytesToRead);
SerialPort->DiscardInBuffer();

List<System::Byte>^ temp = gcnew List<System::Byte>;

int^ counter = gcnew (int);
for (*counter = 0; *counter < *bytesToRead; (*counter)++) {
    temp->Add(My1DArray[*counter]);
}

#include "string.h" //Updated Solution
    float^ f = gcnew (float);
    unsigned int^ temp = gcnew(unsigned int);
	*temp = 0;
	*temp = _byte3;
	*temp = (*temp << 8U) + _byte2;
	*temp = (*temp << 8U) + _byte1;
	*temp = (*temp << 8U) + _byte0


//	memcpy(f, temp,4U); //error


//Updated solution : 

		pin_ptr<float> pinPtr_FloatVal = &(*f);


		pin_ptr<unsigned int> pinPtr_UintVal = &(*temp);


	memcpy_s(pinPtr_FloatVal , 4U, pinPtr_UintVal , 4U); //4U i.e. 4 bytes

private: System::IO::Ports::SerialPort^ mySerialPort;

private: static System::IO::Ports::SerialPort^ mySerialPort;

System::Void MyForm::SerialPort_DataReceived(System::Object^ sender, System::IO::Ports::SerialDataReceivedEventArgs^ e)
{
    uint16_t test = 0;

    test = mySerialPort->BytesToRead;


        this->Invoke(gcnew EventHandler(this, &MyForm::ProcessReceived));

}


    System::Void MyForm::ProcessReceived(System::Object^ sender, System::EventArgs^ e) {

    // my_ReceivedData is just a custom class to parse & store received data
    my_ReceivedData^ status = gcnew my_ReceivedData;


    mySerialPort->Read(status->bytes, 0, length);
    mySerialPort->DiscardInBuffer();

    setAppearance(status->bytes);

}


public: System::Void setAppearance(array<unsigned char>^ bytes) {
    btn_Start->ImageIndex = 3; // function is excecuted, but image is still not updated from it's default
}