?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;

public partial class validate : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Convert.ToString(Session["username"])== "")
        {
            Response.Write("<script language=javascript>alert('請先登錄,然后發(fā)布信息');location='javascript:history.go(-1)'</script>");
            Response.End();
        }
    }
}