Managed C++/CLI

<TALLYMESSAGE xmlns:UDF="TallyUDF">
  <VOUCHER VCHTYPE="Sales" ACTION="Create">
     <VOUCHERTYPENAME>Sales</VOUCHERTYPENAME>
     <ALLLEDGERENTRIES.LIST>
        <REMOVEZEROENTRIES>No</REMOVEZEROENTRIES>
        <ISDEEMEDPOSITIVE>Yes</ISDEEMEDPOSITIVE>
        <LEDGERFROMITEM>No</LEDGERFROMITEM>
        <LEDGERNAME>Customer 1</LEDGERNAME>
        <AMOUNT>-5000</AMOUNT>
     </ALLLEDGERENTRIES.LIST>
  </VOUCHER>
</TALLYMESSAGE>

[XmlRoot(ElementName="ALLLEDGERENTRIES.LIST")]
public class ALLLEDGERENTRIESLIST { 

    [XmlElement(ElementName="REMOVEZEROENTRIES")] 
    public string REMOVEZEROENTRIES { get; set; } 

    [XmlElement(ElementName="ISDEEMEDPOSITIVE")] 
    public string ISDEEMEDPOSITIVE { get; set; } 

    [XmlElement(ElementName="LEDGERFROMITEM")] 
    public string LEDGERFROMITEM { get; set; } 

    [XmlElement(ElementName="LEDGERNAME")] 
    public string LEDGERNAME { get; set; } 

    [XmlElement(ElementName="AMOUNT")] 
    public int AMOUNT { get; set; } 
}

[XmlRoot(ElementName="VOUCHER")]
public class VOUCHER { 

    [XmlElement(ElementName="VOUCHERTYPENAME")] 
    public string VOUCHERTYPENAME { get; set; } 

    [XmlElement(ElementName="ALLLEDGERENTRIES.LIST")] 
    public ALLLEDGERENTRIESLIST ALLLEDGERENTRIESLIST { get; set; } 

    [XmlAttribute(AttributeName="VCHTYPE")] 
    public string VCHTYPE { get; set; } 

    [XmlAttribute(AttributeName="ACTION")] 
    public string ACTION { get; set; } 

    [XmlText] 
    public string Text { get; set; } 
}

[XmlRoot(ElementName="TALLYMESSAGE")]
public class TALLYMESSAGE { 

    [XmlElement(ElementName="VOUCHER")] 
    public VOUCHER VOUCHER { get; set; } 

    [XmlAttribute(AttributeName="UDF")] 
    public string UDF { get; set; } 

    [XmlText] 
    public string Text { get; set; } 
}

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;