asp.net控件的使用

 protected void btnUpload_Click(object sender, EventArgs e)
        {
            bool fileOK = false;
            string path = Server.MapPath("~/uploadimage/");
            if (FileUpload1.HasFile)
            { 
                string fileExtension=System.IO.Path.GetExtension(FileUpload1.FileName.ToLower());
                string[] allowedExtensions = { ".gif",".jpg",".png",".bmp"};
                foreach (string k in allowedExtensions)
                {
                    if (fileExtension == k)
                    {
                        fileOK = true;
                    }
                }

            }
            if (fileOK)
            {
                try
                {
                    FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                    info.Text = "文件上传成功！<br>" + "上传文件名为" + FileUpload1.PostedFile.FileName
                        + "<br>文件大小为:" + FileUpload1.PostedFile.ContentLength / 1024 + "KB" + "<br>文件的MIME类型为:" + FileUpload1.PostedFile.ContentType
                        ;


                }
                catch (Exception ex)
                {
                    info.Text = "文件上传失败，原因：" + ex.Message;

                }
            }
            else
            {
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