how to merge rows in data grid view in run time

Question

 

 
 Output as follows;


 Date          Session         GS              RK Mv MS CMK CNN VRV GS
 7/1/2013    1      coursename(combobox)
 7/1/2013    2
 7/1/2013    3
 7/1/2013    4


But i want the output i run time screen as follows in data grid view;


 Date         Session         GS              RK Mv MS CMK CNN VRV GS

 7/1/2013    1
                    2
                    3
                    4

the date should  not be repeated,it should be merge with rows and gives a single date as 7/1/2013.

how to do.please send the code for merge the rows in data grid view.