adding command button in datagridview using C#

Question

hai friends,

 

 

      please help me in to add a button or link in datagridview  using windows forms using c#.

the button should do the following ..

 

 1) when I clicked on edit link or button in SNO 1 that particular row should be edited and should allow for  updation..

 

      in the same way the remaining rows also should be updated when we click on edit button

 

  2) when i click on edit link, the row must allow for editing and edit  should be renamed to update . as shown below .  

             

sno	name	address	contact	edit
1	chiranjeevi	mdp	7848456	edit
2	venu	vsp	546465	edit
3	naveen	hyd	5465465	edit

 

 

sno	name	address	contact	edit
1	chiranjeevi	mdp	7848456	update
2	venu	vsp	546465	update
3	naveen	hyd	5465465	update