加水印，asp.net

如何加多个水印，并且保存在虚拟目录中，
请问如何实现？
小弟在线等！

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http://ck275601774.blog.163.com/blog/static/123046801200981594229827/

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文字水印 还是 图片水印

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<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>

<%@ Page language="vb" %>

<script runat="server">
Dim FilePath As String = Server.MapPath("Talk.JPG")

Sub Page_Load(Sender As Object, E As EventArgs)
Dim image As System.Drawing.Image = System.Drawing.Image.fromFile( FilePath )
Dim g As Graphics = Graphics.fromImage(image)
g.DrawImage(image, 0, 0, image.Width, image.Height)
Dim f As Font = new Font("华文行楷", 40)
Dim b As Brush = new SolidBrush(Color.Black)
Dim s As String = Left(Request.QueryString("str"), 7)
g.DrawString(s, f, b, 20, 190)
image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)
g.Dispose()
image.Dispose()
End Sub
</script>

只要把这个代码存成一个aspx文件，比如Test.aspx。然后放到wwwroot里面（假设你的虚拟目录是默认的）。再做一个Talk.JPG的图片，就可以在(20, 190)这个地方打印出“华文行楷”这种字体的文字了。

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C#批量给图片添加水印
http://www.heyant.com/html/Download38.html