Change form background

Question

I would like to change a forms background from another form.

I have form1 and form2 in my application, on form2 i have a combobox with the options.
Whan i select a color in the combobox, i want form1's backcolor to change and not form2's.

I used this code:

Form1 form = new Form1();
form.BackColor = Properties.Settings1.Default.Black;

But it doesn't work?

The same thing happens when i try to change form1's opicity!

Scott Lysle · Answer

The backcolor property is private by default override it and set to public; then you can change it from the other form: public override Color BackColor { get { return base .BackColor; } set { base .BackColor = value ; } } private void button1_Click( object sender EventArgs e) { Form2 f = new Form2 (); f.Show(); f.BackColor = Color .Black; }

Vulpes · Answer

It appears that the problem here is that you're creating a new instance of Form1 rather than changing the background color of the existing instance. There are many ways to get an instance of another form in a Windows Forms application. One way that always works is this: Form1 form = (Form1)Application.OpenForms[Form1]; form.BackColor = Properties.Settings1.Default.Black;