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;
using System.Text.RegularExpressions;

public partial class f : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string q = Request.QueryString["style"];
        if (q != null && Regex.IsMatch(q, @"^[a-z\d]+$", RegexOptions.Compiled | RegexOptions.IgnoreCase))
            style.Text = string.Format("<link href=\"/style/{0}.css\" rel=\"stylesheet\" type=\"text/css\">", q);

    }
}
