How do I create an “unfocusable” form in C#?

Question

I\'m looking to create a form in C# that cannot accept focus, i.e. when I click a button on the form, focus is not stolen from the application that currently has the focus.<

Answer 1

This is the "NoFocusForm" I use:

public class NoFocusForm : Form
{
    /// From MSDN 
    /// A top-level window created with this style does not become the 
    /// foreground window when the user clicks it. The system does not 
    /// bring this window to the foreground when the user minimizes or 
    /// closes the foreground window. The window should not be activated 
    /// through programmatic access or via keyboard navigation by accessible 
    /// technology, such as Narrator. To activate the window, use the 
    /// SetActiveWindow or SetForegroundWindow function. The window does not 
    /// appear on the taskbar by default. To force the window to appear on 
    /// the taskbar, use the WS_EX_APPWINDOW style.
    private const int WS_EX_NOACTIVATE = 0x08000000;

    public NoFocusForm()
    { 
        // my other initiate stuff
    }

    /// 

    /// Prevent form from getting focus
    /// 
    protected override CreateParams CreateParams
    {
        get
        {
            var createParams = base.CreateParams;

            createParams.ExStyle |= WS_EX_NOACTIVATE;
            return createParams;
        }
    }
}