Web/eWebEditor/aspx/Default.aspx.cs

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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;
using System.Text;
using System.IO;
using System.Drawing;
using System.Net;

public partial class eWebEditor_upload_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.uploadfile.PostedFile.FileName.Equals(""))
        {
            return;
        }
        else
        {
            string _flag = Request["flag"];
            string _regex = "";
            switch (_flag)
            {
                case "img":
                    _regex = @"^.+\.(jpeg|gif|jpg|png)$";
                    break;
                case "flash":
                    _regex = @"^.+\.(swf)$";
                    break;
                case "media":
                    _regex = @"^.+\.(asf|wmv|avi|rmvb|mpeg|mov|mp3)$";
                    break;
                case "file":
                    _regex = @"^.+\.(rar|zip|doc|pdf|txt|csv)$";
                    break;
                default:
                    _regex = @"^.+\.(a)$";
                    break;
            }

            Regex test = new Regex(_regex.ToLower());
            
            if (test.IsMatch(uploadfile.PostedFile.FileName.ToLower()) == true)
            {
              
                ClientScriptManager cs = Page.ClientScript;
                string imagesfolder = ConfigurationManager.AppSettings["imagesfolder"].ToString();