Posted by mariles on Saturday, October 1, 2011 at 8:31pm.
Do you know how to set up the GUI (buttons, list boxes, etc?)
Table 4.9 is a static table, so all you need to do is to write the content to the textbox1.text when the appropriate button is pressed.
You will need another textbox (textbox2) to enter the item number and period. Another button (say btn2) will do these calculations and write the output to textbox3.text, where textbox3 is the third textbox for displaying the invoice.
You will have to explain to me why you need keypress events if you have input textbox and button presses. Your teacher must have explained that in class.
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