Declare Function db_write Lib "w95_s7m.dll" (ByVal dbno As Integer, ByVal dwno _
  As Integer, _
         ByVal amount As Integer, ByVal value As Integer) As Integer
 
Dim res As Integer
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button3.Click
 
        res = db_write(100, 7, 2, 1)
        Me.Label3.Text = res
 
    End Sub