C# / VB.NET - Aprire un file in modalità Hex

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Read1 As IO.BinaryReader
        Dim Buffer() As Byte
        Dim File As String
        Dim a As String
        a = InputBox("")
        File = a
        If Not IO.File.Exists(File) Then
            MsgBox("File inesistente!")
            Exit Sub
        End If
        Dim Temp As New IO.FileStream(File, IO.FileMode.Open)
        Read1 = New IO.BinaryReader(Temp)
        ReDim Buffer(Read1.BaseStream.Length)
        Read1.Read(Buffer, 0, Read1.BaseStream.Length)
        Read1.Close()
        For I As Int32 = 0 To Buffer.Length - 1
            tex1.Text = (String.Format("{0:X2}", Buffer(I)))
        Next
    End Sub

tex1.Text = (String.Format("{0:X2}", Buffer(I)))

tex1.Text = (String.Format("{0:X2}", Buffer(I)))

TextBox1.Text = TextBox1.Text + " " + String.Format("{0:X2}", Buffer(I))

TextBox1.Text &= String.Format(" {0:X2}", Buffer(I))