Reading NULL Terminated string from file

Is there any simple way to read a null terminated string from a binary file? The problem I have is retrieving the array of bytes making up the string.

The string itself can be variable length.

The method I'm using at the moment is to scan each byte in the file from the current position until I find the NULL character, then skipping back to where the string started, and reading the array of bytes...

Code:

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    'This example actually just reads a string that would be at the beginning of the file
    Dim BR As System.IO.BinaryReader
    BR = New System.IO.BinaryReader(System.IO.File.OpenRead("d:\temp\test.dmt")
    Dim SWA As Boolean = False
    Dim HeaderSize As Integer
    Dim NextChar As Integer
    Do While SWA = False
        NextChar = BR.Read()
        If NextChar = 0 Then
            HeaderSize += 1
            SWA = True
        Else
            BR.Read()
            HeaderSize += 1
            If HeaderSize = 256 Then SWA = True
        End If
    Loop
    BR.BaseStream.Seek(0, IO.SeekOrigin.Begin)
    Dim NTS() As Byte = BR.ReadBytes(HeaderSize)
    Dim Encoder As New System.Text.ASCIIEncoding()
    Dim mHeaderString As String = Encoder.GetString(NTS)

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