C# transparent background for window form

Question

I\'ve already seen Transparent background on winforms?

it doesnt offer solution to my problem. I am using the same method to try to achieve transparency

Answer 1

The way I did it long time ago was to find an unused color for the form background and then set the transparency key to it:

this.BackColor = Color.Magenta;
this.TransparencyKey = Color.Magenta;

Other ways are:

• Creating a background image, painting the transparent area of it with a specific color and setting it as the form BackgroundImage... then setting the TransparencyKey to that color.
• Overriding OnPaintBackground method with an empty method.

[EDIT] As Mario states, normally the default transparent color for the key is Magenta.

Answer 2

public partial class TransprtScrcn : Form
    {
        public TransprtScrcn()
        {
            InitializeComponent();
            this.BackColor = Color.Red;
            this.TransparencyKey = Color.Red;
        }


        protected override void OnPaintBackground(PaintEventArgs e)
        {
            e.Graphics.FillRectangle(Brushes.Red, e.ClipRectangle);
        }
    }
}

Answer 3

This is the best way to make the transparent background of winform.

right after this:

public partial class frmTransparentBackcolor : Form
{
    public frmTransparentBackcolor()
    {
        InitializeComponent();
        //set the backcolor and transparencykey on same color.
        this.BackColor = Color.LimeGreen;
        this.TransparencyKey = Color.LimeGreen;
    }
    protected override void OnPaintBackground(PaintEventArgs e)
    {
        e.Graphics.FillRectangle(Brushes.LimeGreen, e.ClipRectangle);
    }
}

hope this will help.

Answer 4

You can use a picture for this work. The color of bound of picture is Red , Next use this code

this.TransparencyKey = Color.Red;