关于eWebEditor

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;namespace WebEditor.eWebEditor.upload
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {        }        protected void ButUpload_Click(object sender, EventArgs e)
        {
            if (uploadfile.PostedFile.FileName.Equals(""))
            {
                return;
            }
            else
            {
                string _flag = Request["flag"];
                string _regex = "";                switch (_flag)
                {
                    case "img":
                        _regex = @"^.+\.(jpe?g|gif)$";
                        break;
                    case "flash":
                        _regex = @"^.+\.(swf)$";
                        break;
                    case "media":
                        _regex = @"^.+\.(wmv|avi|rmvb|mpeg|mov)$";
                        break;
                    case "file":
                        _regex = @"^.+\.(rar|zip|doc|pdf|txt)$";
                        break;
                    default:
                        _regex = @"^.+\.(jpe?g|gif|swf|wmv|avi|rmvb|mpeg|mov|rar|zip|doc|pdf|txt)$";
                        break;
                }                Regex test = new Regex(_regex);                if (test.IsMatch(uploadfile.PostedFile.FileName) == true)
                {
                    ClientScriptManager cs = Page.ClientScript;
                    
                    
                    
                    string imagesfolder = ConfigurationManager.AppSettings["imagesfolder"].ToString();
                    string filename = Common.UploadFile(uploadfile, imagesfolder);                    string apurl = Request.Url.ToString();
                    string apurl2 = Request.CurrentExecutionFilePath;
                    string tempurl = apurl.Substring(0, apurl.IndexOf(apurl2));
                    string appurl = Request.ApplicationPath;
                    string hurl;
                    if (appurl.Length == 1)
                        hurl = appurl + filename.Replace("~/", "");
                    else
                        hurl = appurl + "/" + filename.Replace("~/", "");
                    string imgpreview = tempurl + hurl;                    cs.RegisterClientScriptBlock(this.GetType(), "tt", "parent.document.all('divProcessing').style.display='none';parent.document.all('imgPreview').src='" + imgpreview + "';parent.document.all('Hurl').value='" + hurl + "';parent.document.all('d_fromurl').value='';", true);                    ((Label)myform.FindControl("labelinfo")).Text = "文件上传成功！<a href=\"\">重新上传</a>";
                }
                else
                {
                    ((Label)myform.FindControl("labelinfo")).Text = "您上传的文件类型不正确！<a href=\"\">重新上传</a><script>parent.document.all('divProcessing').style.display='none';</script>";
                }
            }
        }
    }
}问题：红色部分在VS2005中不能通过编译，哪位高手帮我修改一下啊