the text box item to be displayed in the row wise in the dgv

Question

 Hours Combobox

 
In design page in the hours i have 5. when i click that hours 5 that hours should be displayed in the textbox.
 
Output i want as follows;
 
Hours 5 (combo box)
Textbox
 
when i click 5, that 5 is to be displayed in the textbox.
 
Then i have one button. when i click that button, that 5 displayed in the textbox should be shown in display in datagrdiview as follows;
 
in datagridview as follows;
 
Days
1
2
3
4
5