(VB) help with drawing changing text directly to form

I need to draw a string to the form directly on it that has a changing variable in it here is the string: "score:" & score
what happens though is every time the score changes the event simply paints over the old value and leaves a jumbled mess of numbers 1 over the other i need help on how i would draw text directly to the form with the ability to have a changing variable in it heres my code:

Public Sub DrawString()
Dim formGraphics As System.Drawing.Graphics = Me.CreateGraphics()
Dim drawString As String = String.Format("Score: {0}", score)
Dim drawFont As New System.Drawing.Font("Arial", 16)
Dim drawBrush As New _
System.Drawing.SolidBrush(System.Drawing.Color.Black)
Dim x As Single = 1.0
Dim y As Single = 1.0
Dim drawFormat As New System.Drawing.StringFormat
formGraphics.DrawString(drawString, drawFont, drawBrush, _
x, y, drawFormat)
drawFont.dispose()
drawBrush.Dispose()
formGraphics.Dispose()


End Sub

 

any1 i need help pls

 

ok i got this to work although its not pretty i use this method to draw the text onto the form:

Protected Overrides Sub OnPaint( _
ByVal e As System.Windows.Forms.PaintEventArgs)
Dim g As Graphics = e.Graphics
g.DrawString("Score:" & score, _
New Font("Arial", 16), _
Brushes.Black, 1, 1)
MyBase.OnPaint(e)

End Sub

i then in the form designer tab created a rectangle(named inval) over the area where the text was drawn and then invalidated that area by do this every time the value of "score" went up:

Dim bmpcontainter As RectangleF
bmpcontainter = inval.Bounds
Me.Invalidate(Rectangle.Round(bmpcontainter))

thats it took me long enough