Asp.net简单实现给图片增加文字水印

<%@ 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>

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.web>
    <globalization requestEncoding="gb2312" responseEncoding="gb2312" culture="zh-CN" fileEncoding="gb2312"/>
    </system.web>
</configuration>