How to disable a button, and to activate it, should you click on another button?

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How to disable a button, and to activate it, should you click on another button?

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#1 by (3 votes)
#2 by (2 votes)

2

I created a calculator using Windows Forms, it ran perfectly, but when I click the operation button before the number button (to enter a value on the display) an error occurs that closes my program alone. I wanted to know how I can do so that the operation buttons are initially disabled, and after clicking on the number button is available to carry out the operation. Thanks for the help ..

c# windows forms button

asked by anonymous 03.06.2016 / 00:53

2 answers

2

In the constructor of your form class you put the button to start disabled.

public Calculadora(){
InicializaComponent();
btnSomar.Enabled = false;
//outros botoes que voce queira deixar desabilitados
}

Now in the click event of the number button you put btnSomar.Enabled = true; to enable the button.

03.06.2016 / 13:07

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score 3 · Accepted Answer

You have two solutions:

1 - Use try / catch , where in case of an error your program will fall into catch and then you will see a message or something like that.

2 - As @Jesters pointed out in Load of your Form all the calculation buttons are disabled (*, +, -,%). It is only after you click on one of the numbers to perform your operation that these buttons will be enabled and available for operation.

No load of your Form:

btnSoma.Enabled = False;
btnSubt.Enabled = False;
btnMult.Enabled = False;
btnDivid.Enabled = False;

Finally, in the Click event of the numbers, when one of them is clicked you will enable the TextBox of operations:

btnSoma.Enabled = True;
btnSubt.Enabled = True;
btnMult.Enabled = True;
btnDivid.Enabled = True;