asp.net图片添加水印

using System;
using System.Net;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
        ///  <summary>
        /// 在图片上增加文字水印
        ///  </summary>
        ///  <param name="Path">原服务器图片路径 </param>
        ///  <param name="Path_sy">生成的带文字水印的图片路径 </param>
        public static void AddWater(string Path, string Path_sy)
        {
            string addText = "文字水印";
            Image image = Image.FromFile(Path);
            Graphics g = Graphics.FromImage(image);
            g.DrawImage(image, 0, 0, image.Width, image.Height);
            Font f = new Font("Verdana", 60);
            Brush b = new SolidBrush(Color.Green);

            g.DrawString(addText, f, b, 35, 35);
            g.Dispose();

            image.Save(Path_sy);
            image.Dispose();
        }

        ///  <summary>
        /// 在图片上生成图片水印
        ///  </summary>
        ///  <param name="Path">原服务器图片路径 </param>
        ///  <param name="Path_syp">生成的带图片水印的图片路径 </param>
        ///  <param name="Path_sypf">水印图片路径 </param>
        public static void AddWaterPic(string Path, string Path_syp, string Path_sypf)
        {
            Image image = Image.FromFile(Path);
            Image copyImage = Image.FromFile(Path_sypf);
            Graphics g = Graphics.FromImage(image);
            Rectangle rect = new Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height);
            g.DrawImage(copyImage, rect, 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
            g.Dispose();

            image.Save(Path_syp);
            image.Dispose();
        }