Good night, I have 3 textbox, and I would like someone to provide a code to help me, when I select the product on the grid the total value is added in textbox1, and so on, the more I add products, the more it adds, I would like a code that when typing the value received in textbox2, the change already appeared in textbox3, I do not know if I would have to use a keypress or something, so I need help.