How to change component attributes between Forms?

Question

I have an application in C# with a parent Form (FRM_PRINCIPAL) that contains a button (BTN_ACT) that calls a Child Form (Form2), which in turn contains a button (BTN_REG) containing some functions, among which one would make BTN_ACT invisible (BTN_ACT.Visible=False;). How would I do that? Simply put: Basically make the first Form button invisible via a second Form button.

Answer 1

In your FRM_PRINCIPAL, you need to create a public method to set the visibility of your button.

public void AlteraVisibilidadeBtnAct(bool visivel)
{
    this.BTN_ACT.Visible = visivel;
}

In your BTN_REG button click method, you call the method created above as follows, if Form2 is a child of your FRM_PRINCIPAL. One form is the child of the other when the Mdiparent property is set for the child.

private void BTN_REG_Click(object sender, System.EventArgs e)
{
    ParentForm.AlteraVisibilidadeBtnAct(false);
}

If Form2 is not FRM_PRINCIPAL child, you must add FRM_PRINCIPAL to the Form2 constructor, and then access it in the click event.

private FRM_PRINCIPAL frmPrincipal;

public Form2(FRM_PRINCIPAL frmPrincipal)
{
    this.frmPrincipal = frmPrincipal;
}

private void BTN_REG_Click(object sender, System.EventArgs e)
{
    frmPrincipal.AlteraVisibilidadeBtnAct(false);
}