Unable to set BackGround image of Panel control in ASP.Net

I am trying to set background image of panel in following way

But as code shows i need to show the image each time in server..how can i set bmp as background image directly..as it might create problem when deployed on server

Dim bmp As New Bitmap(1500, 2500)
        Dim g As Graphics = System.Drawing.Graphics.FromImage(bmp)
Dim img_converter As New ImageConverter()
            Dim bytes As Byte() = DirectCast(img_converter.ConvertTo(bmp, GetType(Byte())), Byte())
            File.WriteAllBytes(Server.MapPath("~/Images/OT1.jpeg"), bytes)
            pnl001.BackColor = Color.White
            pnl001.BackImageUrl = "~/Images/OT1.jpeg"
            pnl001.Attributes.Add("style", "background-repeat:no-repeat")