Interaction between forms?

Question

In my program, I inserted a button and a panel. When the button is clicked, logic inserts another form into the panel superimposing the form initial.

In the form2 that appears has a return button, which causes the form2 disappear and reappear the form1, but no code I try to use is working. The button code is as follows::

//FORMULÁRIO CONTEUDO

this.panel1.Controls.Clear();
Conteudo frm = new Conteudo();
frm.TopLevel = false;

panel1.Controls.Add(frm);
frm.FormBorderStyle = FormBorderStyle.None;
panel1.Height = this.Size.Height;
panel1.Width = this.Size.Width;
frm.Size = new Size(this.panel1.Width, this.panel1.Size.Height);
Application.DoEvents();
frm.Location = new Point(0 + this.panel1.AutoScrollPosition.X, 0 + this.panel1.AutoScrollPosition.Y);
panel1.BringToFront();
panel1.Visible = true;
panel1.BackColor = Color.WhiteSmoke;
frm.Show();

And in the form2, on the button, I used the following code, and other so many variants:

Form2 frm = new Form2();
frm.Controls.Clear();
this.Close();
frm.Refresh();

If you can help me, I really appreciate it. The opening part of the form is working, but the return button to form1 does not work, when I can, using the code above, form 1 is only white.

Answer 1

//To call a form simply do.

protected void btnChamaForm2_OnClick(object sender, EventArgs e)
{
  Form2 form2 = new Form2();
  form2.show();

  //e fecha o form atual assim
  this.visible = false; ou this.Clos();
}

//To return to Form1, do the same thing.

protected void btnRetornar_OnClick(object sender, EventArgs e)
{
   Form1 form1 = new Form1();
   form1.show();

   //fecha o form atual.
   this.visible = false; ou this.Clos();
}

protected void btnRetornar_OnClick(object sender, EventArgs e)
{
   Form1 form1 = new Form1();
   form1.show();

   //fecha o form atual.
   this.visible = false; ou this.Clos();
}

Answer 2

So Bruno, apparently you’re cleaning the Form2 Controls, I believe that’s what’s leaving the form blank, and you don’t need to instantiate the form again because when you click the button this is already the form, in the method in the controller you have to receive as parameters this:

protected void btnRetornar_OnClick(object sender, EventArgs e)
{
     this.Close();
}

if you refresh the new instated form it will appear blank again because you have removed the Controls from it, try to do only the basics above.

Answer 3

Bruno, on the Form1 button that calls form2 you enter the code:

Form2 frm = new Form2();
frm.ShowDialog();

On the button that closes Form2 and returns to Form1 you can put the following code.

//não há a necessidade de instanciar novamente o Form2 pois ele já foi instanciado.
this.Close(); // que ele limpa automaticamente os controles. mas pode usar o clear também se preferir.

Answer 4

To open form2 do the following:

//Limpe o form atual da forma que está fazendo

//Crie uma instância de Form2
Form2 form2 = new Form2();
//Exiba o form2
form2.ShowDialog();
//Verifica se o form foi fechado
if(form2.IsDisposed)
{
    //Código para montar o form anterior
    //Acredito ser o primeiro bloco de código que você postou.
}

To return from form2 to Form1 do the following:

protected void btnRetornar_OnClick(object sender, EventArgs e)
{
    this.Close();
}