get the bytes of the file for Scanner - VB.NET

Question

I need help to get the bytes of a file in a textbox. It's for an antivirus scanner.

Well the scanner is Hexadecimal, but I have been told to convert the HEX string to Bytes and compare it with the Bytes of the file. My question is: How do I get the Bytes from the file?

Could you help me with an example?

Well this is what I tried to do to get the bytes:

 ' Opendia IS OPENFILEDIALOG
    Dim result As DialogResult = OpenDia.ShowDialog()

    ' Test result.
    If result = Windows.Forms.DialogResult.OK Then

        ' Get the file name.
        Dim path As String = OpenDia.FileName
        Try

            Dim bytes As Byte() = File.ReadAllBytes(path)
            'I try to show the Bytes of the file in the textbox

            TextBox1.Text = bytes.Length

        Catch ex As Exception

            MsgBox(ex.Message)

        End Try
    End If

Post where is the Scanner : Scanner