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Asp.net(C#)給圖片加上水印效果

下面的代碼中，加文字水印和加圖片水印的代碼不能共存
我是為了方便顯示才寫在一塊的

    private void Btn_Upload_Click(object sender, System.EventArgs e)

        

{

            if(UploadFile.PostedFile.FileName.Trim()!="")

            

{

                //上傳文件

                string extension = Path.GetExtension(UploadFile.PostedFile.FileName).ToUpper();

                string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();

                string path = Server.MapPath(".") + "/UploadFile/" + fileName + extension;

                UploadFile.PostedFile.SaveAs(path);

                //加文字水印，注意，這里的代碼和以下加圖片水印的代碼不能共存

                System.Drawing.Image image = System.Drawing.Image.FromFile(path);

                Graphics g = Graphics.FromImage(image);

                g.DrawImage(image, 0, 0, image.Width, image.Height);

                Font f = new Font("Verdana", 32);

                Brush b = new SolidBrush(Color.White);

                string addText = AddText.Value.Trim();

                g.DrawString(addText, f, b, 10, 10);

                g.Dispose();

                //加圖片水印

                System.Drawing.Image image = System.Drawing.Image.FromFile(path);

                System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath(".") + "/Alex.gif");

                Graphics g = Graphics.FromImage(image);

                g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);

                g.Dispose();

                //保存加水印過后的圖片,刪除原始圖片

                string newPath = Server.MapPath(".") + "/UploadFile/" + fileName + "_new" + extension;

                image.Save(newPath);

                image.Dispose();

                if(File.Exists(path))

                

{

                    File.Delete(path);

                }

                Response.Redirect(newPath);

            }

        }

//加圖片水印
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(@"G:\Documents and Settings\Administrator\桌面\桌面圖片\500_XrN4fq31.jpg");
//設(shè)置顏色矩陣
int lucencyPercent = 25;
float[][] matrixItems ={
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, (float)lucencyPercent/100f, 0},
new float[] {0, 0, 0, 0, 1}};

ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
ImageAttributes imgAttr = new ImageAttributes();
imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//繪制陰影圖像
Graphics g = Graphics.FromImage(image);
g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel, imgAttr);
g.Dispose(); 　

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