Change form background

Gerade Geldenhuys

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!

2 Replies

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Scott Lysle15y ago
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;
        }
Vulpes15y ago
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;