how to change button text in grid view at run time

Question

hello  friends 

i am new in c# i am facing problem to change button text  in gridview for example

 

i have two button's  in winform   

1) Buy

2)Sell

i  want to do when user click on buy button then insert row with SELL button  cloumn in gridvew..

and when user click on SELL  button then insert row with BUY button . in gridview