Graphics til en placeholder

Heg har nedenstående sun som opretter en cirkeldiagram. Mit spørgsmål er nu hvordan jeg får smit resultatet i en placeholder?

    Protected beholder As System.Web.UI.Webcontrols.placeholder

    Public Sub Page_Load(Source As Object, E as EventArgs)
        Dim arrLabels(4) As String
        Dim arrData(4) As String
           
        arrData(0) = 9
        arrData(1) = 19
        arrData(2) = 10
        arrData(3) = 13           
       
        arrLabels(0) = “I love it!”
        arrLabels(1) = “It’s ok”
        arrLabels(2) = “It’s Amazing500”
        arrLabels(3) = “It’s Amazing2”               
        cirkeldiagram(arrLabels,arrData,350,350)
    end sub

    Public sub cirkeldiagram(arrLabels As array,arrData as array,imgheight as integer,imgwidth as integer)
        Dim i As Integer
        Dim b As New Bitmap(imgheight, imgwidth)
        Dim g As Graphics
        Dim sum AS integer
        Dim current As Single = 0
        Dim total As Single = 0
        Dim encoderParams as System.Drawing.Imaging.EncoderParameters = new System.Drawing.Imaging.EncoderParameters()
        Dim quality as long
        Dim arrayICI as ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()
        Dim jpegICI as ImageCodecInfo
        Dim x as integer
   
        'Set up graphics
        g = Graphics.FromImage(b)
        g.Clear(color.yellow)
        g.Smoothingmode = Smoothingmode.HighQuality
       
        'Hvor mange data
        For i = 0 To arrData.Length - 1       
            sum += arrData(i)       
        Next i
       
               
        i = 0       
        For i = 0 To arrData.Length - 1       
            current = arrData(i) / sum * 360
            'Områder
            g.FillPie(New SolidBrush(SelectColor(i)), 0, 00, imgwidth, imgheight, total, current)
            'streg
            g.DrawPie(Pens.Black, 0, 0, imgwidth, imgheight, total, current)
            total += current       
        Next i
       
        Dim img as new System.Web.UI.WebControls.image
        beholder.controls.add(img)   
    end sub