上传函数（全集）

        /// <summary>
        /// 文件上传，适用于.net2.0
        /// </summary>
        /// <param name="file">上传域FileUpload控件</param>
        /// <param name="SavePath">图片存储路径，默认为upload/</param>
  /// <param name="WatermarkImgFile">水印图片地址，留空则无水印</param>
        /// <returns>返回文件名</returns>
        public string FileUp(System.Web.UI.WebControls.FileUpload file,string SavePath, string WatermarkImgFile)
        {
            if (file.HasFile)
            {
                string picName = file.PostedFile.FileName;
                int pos = picName.LastIndexOf(".");
                string excName = picName.Substring(pos);
                kin.Web.CommTool commtool = new kin.Web.CommTool();
                string newName = kin.Web.CommTool.RandomFileName() + excName;

    string phyicPath = HttpContext.Current.Server.MapPath(kin.Web.CommTool.GetAppPath + SavePath);
    //如果目录不存在，则创建
    if (Directory.Exists(phyicPath) == false)
                    Directory.CreateDirectory(phyicPath);
                file.PostedFile.SaveAs(phyicPath + newName);

    if (WatermarkImgFile == "")
    {
                    //无水印，直接返回
                    return newName;
                }

                System.Drawing.Image image = System.Drawing.Image.FromFile(phyicPath + newName);
    //if (WatermarkType == 1)
    //{
     ////加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
     //Graphics g = Graphics.FromImage(image);
     //g.DrawImage(image, 0, 0, image.Width, image.Height);
     //Font f = new Font("Verdana", 12);
     //Brush b = new SolidBrush(Color.White);
     //string addText = WatermarkString;
     //g.DrawString(addText, f, b, 10, 10);
     //g.Dispose();
    //}
    //else if (WatermarkType == 2) {
    //加图片水印
    System.Drawing.Image copyImage = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(kin.Web.CommTool.GetAppPath + WatermarkImgFile));
    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();
    //}

                //保存加水印过后的图片,删除原始图片
                string newName2 = kin.Web.CommTool.RandomFileName() + excName;
                image.Save(phyicPath + newName2);
                image.Dispose();
                File.Delete(phyicPath + newName);
                return newName2;
            }
            else
            {
                return "";
            }
        }