Clearing graphics?

[mcerk]

Hi.

I'm drawing on picturebox with backgroudn image.

How can I clear graphics?

 

I want that Background image is still shown.

 

       Dim G As Graphics = Me.picMap.CreateGraphics()

       'coordinate sistem
       Dim TranslateDx As Long = -375050
       Dim TranslateDy As Long = -194050
       Dim ScaleDx As Single = Me.picMap.Width / (624250 - 375050)
       Dim ScaleDy As Single = Me.picMap.Height / (29850 - 194050)

       G.TranslateTransform(TranslateDx, TranslateDy, MatrixOrder.Append)
       G.ScaleTransform(ScaleDx, ScaleDy, MatrixOrder.Append)
       

'here I want to clear graphics to draw new line


       'draw line
       PenStojisce.EndCap = LineCap.Triangle
       G.DrawLine(PenStojisce, Me.BindingContext(ds.Tables(0)).Current("X1"), Me.BindingContext(ds.Tables(0)).Current("Y1"), Me.BindingContext(ds.Tables(0)).Current("X2"), Me.BindingContext(ds.Tables(0)).Current("Y2"))

[mcerk]

picMap.Refresh