how to pass the date and session in message box

int iRow = 0;
           this.datagridView.RowCount = 24;
           for (int i = 0; i < 6; i++)
           {
               DateTime newDate = dt_startweek.Value.AddDays(i);
               for (int newIndex = 1; newIndex <=4; newIndex++)
               {
                   datagridView[0, iRow].Value = newDate.ToString("dd MMM");
                   datagridView[1, iRow].Value = newIndex.ToString();
                   datagridView.Rows[iRow].Height = 25;
                   iRow = iRow + 1;
               }
           }

string msg  = "selected course is allocated in date and session";