路径和权限问题，以下代码可供参考：

string pathfile = upImg.PostedFile.FileName;
         string type =

pathfile.Substring(pathfile.LastIndexOf(".") + 1);
        string filename =

System.DateTime.Now.ToString("yyMMddhhmmssff") + (".") + type;
        if (type == "jpg" || type == "JPG" || type == "png")
        {
            if (upImg.PostedFile.ContentLength > 1024 * 1024)
            {
                Page.RegisterStartupScript("js",

"<script>alert('图片过大！')</script>");
            }
            else
            {
                try
                {
                    byte[] filedata = new

byte[upImg.PostedFile.ContentLength];
                    Stream stream =

upImg.PostedFile.InputStream;
                    stream.Read(filedata, 0,

upImg.PostedFile.ContentLength);
                    stream.Close();
                    imgService.imgService services = new

imgService.imgService();
                    services.Url =

System.Configuration.ConfigurationManager.AppSettings["imgServic

e.imgService"];
                    services.uploadBrandImage(filedata,

txtBrandNo.Text, filename);
                    Image1.ImageUrl =

System.Configuration.ConfigurationSettings.AppSettings["ImgUrl"]

+ "/getbrandimage.ashx?brand_No=" + txtBrandNo.Text.ToString() +

"&width=60&height=80";
                    //Page.RegisterStartupScript("js",

"<script>alert('上传成功！')</script>");
                }
                catch
                {
                    Page.RegisterStartupScript("js",

"<script>alert('上传失败！')</script>");
                }
            }
        }
        else
        {
            Page.RegisterStartupScript("js", "<script>alert('上

传图片格式不正确！')<script>");
        }
    }