plz suggest me...given below code not to save any value in session variable i want to save checkbox checked value in session and use them in a popup window i get a null reference exception on popup page in session...thanks
dal.cs
using System;
using System.Data;
using System.Configuration;
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.Data.SqlClient;
public class dal
{
SqlConnection con;
SqlCommand cmd;
SqlDataAdapter adap;
DataSet ds;
SqlDataReader rd;
public dal()
{
con = new SqlConnection(ConfigurationSettings.AppSettings["ctr"]);
ds = new DataSet();
}
public DataSet PopUpQuali(string StuID)
...
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