c#图片上传和加水印

添加一个FileUpload控件,然后再添加一个image控件
//上传图片
 protected void BtnUpload_Click(object sender, EventArgs e)
    {
       
        //上传图片
        //取出文件路径
        string FileFullName = this.FileUpload1.PostedFile.FileName;
        //取出文件名
        string FileName = FileFullName.Substring(FileFullName.LastIndexOf("\\")+1);
        //取出文件类型
        string FileType = FileFullName.Substring(FileFullName.LastIndexOf(".") + 1);
        //获取文件要存的路径
        string SavePath = Server.MapPath("upload") + "\\" + FileName;
        FileType = FileType.ToLower();
        if (FileType == "jpg" || FileType == "bmp" || FileType == "gif")
        {
            //保存路径
            this.FileUpload1.PostedFile.SaveAs(SavePath);
            this.Image1.ImageUrl = SavePath;
        }
        else
        {
            Response.Write("<script language='javascript'>alert('对不起,图片格式错误');</script>");
        }
    
    }
    /**/
    /**/
    /**/
    /// <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>
    protected void AddShuiYinWord(string Path, string Path_sy)
    {
        string addText = "测试水印";
        System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
        g.DrawImage(image, 0, 0, image.Width, image.Height);
        System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
        System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);

        g.DrawString(addText, f, b, 15, 15);
        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>
    protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
    {
        System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
        System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
        g.DrawImage(copyImage,new System.Drawing.Rectangle(0,0, 100, 20), 0, 0, copyImage .Width,copyImage .Height, System.Drawing.GraphicsUnit.Pixel);
        //g.DrawImage(水印图象名,水印区域大小(x坐标,y坐标,宽,高),水印图象x坐标,水印图象y坐标,水印图象宽,水印图象高,方式)
        g.Dispose();
        image.Save(Path_syp);
        image.Dispose();

    }