date picker foramt to be date and month in DGv month as JAN
                            
                         
                        
                     
                 
                
                      design as follows in data grid view;;
Date  Session  Column name  Column name Column name Column name Column name 
18 1  1
18 1  2
18 1  3
18 1  4
in run mode  date  inpicker format is  date, month in data grid view.
month should be character as example jan
Code as follows;
  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.Day.ToString() +"" + newDate.Month.ToString();
  datagridView[1,iRow].Value = newIndex.ToString();
  iRow = iRow + 1;
  }
  }
  //datagridView[0,iRow].Value = newDate.ToShortDateString().ToString();
for the month code in data grid view mention code as
datagridView[0, iRow].Value = newDate.Day.ToString() +"" + newDate.Month.ToString();
that month shluld be character as jan not '1' in number.
output as follows in run mode in data grid view.the month to be char like Jan
Date  Session  Column name  Column name Column name Column name Column name 
18 jan  1 
18 jan  2
18 jan  3
18 jan  4
 
try this
datagridView[0, iRow].Value = newDate.Day.ToString() +"" + newDate.Month.ToString("MMM");
i try your solution above solution but the output shows as 
Date  Session  Column name  Column name Column name Column name Column name 
18 MMM 1 
18 MMM 2
18 MMM 3
18 MMM 4
not shows the correct output .
i want the output as follows;
18 jan  1 
18 jan  2
18 jan  3
18 jan  4