不會的就放這邊

Button1.Location = New Point(100, 100)

Dim PictureBox1 As New PictureBox()
Dim WithEvents Button1 As New Button

<STAThread()> _
Public Shared Sub Main()
    Application.EnableVisualStyles()
    Application.Run(New Form1())
End Sub

Private Sub InitializePictureBoxAndButton()

    Me.Controls.Add(PictureBox1)
    Me.Controls.Add(Button1)
    Button1.Location = New Point(175, 20)
    Button1.Text = "Stretch"

    ' Set the size of the PictureBox control.
    Me.PictureBox1.Size = New System.Drawing.Size(140, 140)

    'Set the SizeMode to center the image.
    Me.PictureBox1.SizeMode = PictureBoxSizeMode.CenterImage

    ' Set the border style to a three-dimensional border.
    Me.PictureBox1.BorderStyle = BorderStyle.Fixed3D

    ' Set the image property.
    Me.PictureBox1.Image = New Bitmap(GetType(Button), "Button.bmp")
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
    ' Set the SizeMode property to the StretchImage value.  This
    ' will enlarge the image as needed to fit into
    ' the PictureBox.
    PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
End Sub

Try
    Process.Start("http://www.microsoft.com")
Catch ex As Exception
    MsgBox("Can't load Web page" & vbCrLf & ex.Message)
End Try

Dim number As Integer = 8
Select Case number
    Case 1 To 5
        Debug.WriteLine("Between 1 and 5, inclusive")
        ' The following is the only Case clause that evaluates to True.
    Case 6, 7, 8
        Debug.WriteLine("Between 6 and 8, inclusive")
    Case 9 To 10
        Debug.WriteLine("Equal to 9 or 10")
    Case Else
        Debug.WriteLine("Not between 1 and 10, inclusive")
End Select

    Public Function AsciiStringToHexString(ByVal asciiString As String) As String
        Dim ascii() As Byte = System.Text.Encoding.Default.GetBytes(asciiString)
        Dim count As Integer = ascii.Length
        Dim hexArray(count - 1) As String
        For idx As Integer = 0 To count - 1
            hexArray(idx) = ascii(idx).ToString("x2")
        Next
        Return String.Join(" ", hexArray)
    End Function


    Public Function HexStringToAsciiString(ByVal hexString As String) As String
        Dim array() As String = hexString.Split(New Char() {" "c}, StringSplitOptions.RemoveEmptyEntries)
        For idx As Integer = 0 To array.Length - 1
            array(idx) = Chr(CInt(String.Format("&h{0}", array(idx))))
        Next
        Return String.Join(String.Empty, array)
    End Function


    Private Sub tbxASCII_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbxASCII.TextChanged
        If Me.ActiveControl Is sender Then
            tbxHex.Text = AsciiStringToHexString(tbxASCII.Text)
        End If
    End Sub

    Private Sub tbxHex_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbxHex.TextChanged
        If Me.ActiveControl Is sender Then
            tbxASCII.Text = HexStringToAsciiString(tbxHex.Text)
        End If
    End Sub
End Class

My.Computer.FileSystem.DeleteFile("C:\test.txt")

if NOT IsNumeric(TextBox1.Text) Then
   MessageBox.Show ("欄位輸入必須為數值")
   Exit Sub
End If

 Public Function AsciiStringToHexString(ByVal asciiString As String) As String
        Dim ascii() As Byte = System.Text.Encoding.Default.GetBytes(asciiString)
        Dim count As Integer = ascii.Length
        Dim hexArray(count - 1) As String
        For idx As Integer = 0 To count - 1
            hexArray(idx) = ascii(idx).ToString("x2")
        Next
        Return String.Join(" ", hexArray)
    End Function


    Public Function HexStringToAsciiString(ByVal hexString As String) As String
        Dim array() As String = hexString.Split(New Char() {" "c}, StringSplitOptions.RemoveEmptyEntries)
        For idx As Integer = 0 To array.Length - 1
            array(idx) = Chr(CInt(String.Format("&h{0}", array(idx))))
        Next
        Return String.Join(String.Empty, array)
    End Function


    Private Sub tbxASCII_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbxASCII.TextChanged
        If Me.ActiveControl Is sender Then
            tbxHex.Text = AsciiStringToHexString(tbxASCII.Text)
        End If
    End Sub

    Private Sub tbxHex_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbxHex.TextChanged
        If Me.ActiveControl Is sender Then
            tbxASCII.Text = HexStringToAsciiString(tbxHex.Text)
        End If
    End Sub

Dim FileName As String
Dim result(100) As String
Dim count As Integer

    FileName = Dir("C:\temp\*.txt", vbNormal)
    count = 0
    Do While FileName <> ""
     Debug.Print FileName
     result(count) = FileName
     FileName = Dir
     count = count + 1
    Loop