ASP.NET 2.0,C#----图像特效处理

              {
                  MessageShow("生成图片错误！" + ex.Message);
                  throw;
              }
              graphics.Dispose();
              bitmap.Dispose();
          }

          // 图像压扁
          protected void btnStave_Click(object sender, EventArgs e)
          {
              System.Drawing.Image img = System.Drawing.Image.FromFile(path);
              // 宽度不变
              int w = img.Width;
              //    高度为原始高度的1/2
              int h = img.Height / 2;

              // 防止过度变形
              if (w < 1) w = 10;
              if (h < 1) h = 0;
              bitmap = new Bitmap(w, h);
              graphics = Graphics.FromImage(bitmap);
              graphics.DrawImage(img, 0, 0, w, h);
              try
              {
                  bitmap.Save(Server.MapPath("./_Stave.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg);
                  MessageShow("已经生成图片，路径为" + @Server.MapPath("./_Stave.jpg").Replace("", ""));

              }
              catch (Exception ex)
              {
                  MessageShow("生成图片错误！" + ex.Message);