graphic in imagbutton , important?

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VB

ASP.NET

i need to put red point in ImageButton when iam click to imagebutton (e.x,e.y)

code :
Dim p As New Pen(Brushes.Red, 3)
Dim g As Graphics=Graphics.FromImage()

Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click

Session("@cord_x") = e.X
Session("@cord_y") = e.Y


Dim s As String
s = (p, Session("@cord_x"), Session("@cord_y"))

end sub

what solution ????????