datagridview cell validation problem

I have a datagridview, in that when i press enter key at the last column of the row it creates a new row.First column name is code and last column is datagridviewbuttoncolumn  named void. when i click void button,the entire row have to be deleted.

For validating the code cell,i wrote e.cancel=true to stay the cursor in same cell if it is empty.

When leaving the code cell empty and all the other columns are filled, i cant click the void button and it stays the cursor in code column itself.

I want to enable the click event to enable when the column is empty but it wont move to next cell of datagridview.

Is there any possibilities to do this....