protected string showInfo(int id)
    {
        [color=#FF0000]if ( int id = null)[/color]
        { 
        string sql = "select top 5 * from  context";
        }
        else
        {
            string sql = "select top 5 * from  context where listid=" + id + "";
        }
        string tbody = "";
        OleDbDataReader my_reader;
        OleDbCommand my_comm = new OleDbCommand();
       
        my_comm.CommandText= sql;
        my_comm.CommandType = CommandType.Text;
        my_comm.Connection = my_conn;
        my_conn.Open();
        my_reader = my_comm.ExecuteReader();
                   
        }

 if (  id == null)
        { 
        string sql = "select top 5 * from  context";
        }
        else
        {
            string sql = "select top 5 * from  context where listid=" + id + "";
        }

if (id <= 0)