Write hex in little endian

[extream87]

Hello i need to write hex to an file.

Im using this to read in big endian/little endian

Dim beBOM As New System.Text.UnicodeEncoding(True, True)
Dim littleEndian As Long
Dim bigEndian As Long
Using fs As New IO.FileStream("C:\Temp\theFile.bin", IO.FileMode.Open),
br As New IO.BinaryReader(fs, beBOM)
fs.Position = &H12
Dim startIdx As Integer = 0
Dim b() As Byte = br.ReadBytes(4)
littleEndian = BitConverter.ToInt32(b, startIdx)
bigEndian = BitConverter.ToInt32(b.Reverse.ToArray, startIdx)
End Using

Numericupdown1.value = littleEndian.ToString
MessageBox.Show(bigEndian.ToString())

In this case littleEndian is showed in Numericupdown1

My target is change the value and write again to file but this time in hex.

Thanks

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