SqlConnection con = new SqlConnection("Data Source=SERVER; Integrated Security=SSPI;persist security info=True;Initial Catalog=DBNAME;");
        string empId=Request.QueryString["eid"].ToString();
        SqlCommand cmd=new SqlCommand(string.Format("SELECT EmpName FROM empTable WHERE empId='{0}'",empId),con);
        con.Open();
        string empName = Convert.ToString(cmd.ExecuteNonQuery());
        con.Close();