OK, hi again and thank you for your continous answering, I cant repay you but I am truly grateful...

anyway,

I have a datagridview where i manually add 4 columns (A,B,C,D) respectively and has 4 textbox outside (ta,tb,tc,td) respectively.
now i have a button where when i push it strings form ta~td will go a row of A~D, and when i push the button again strings for ta~td will be go to the next row of A~D.
what should i put on my button click event ..
thank you