C#

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    const int WM_NCHITTEST = 0x84;

    const int HTCLIENT = 1;
    const int HTCAPTION = 2;
    const int HTSIZE = 4;
    const int HTBOTTOMLEFT = 16;

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        if (m.Msg == WM_NCHITTEST)
        {
            if (m.Result == (IntPtr) HTCLIENT)
                m.Result = (IntPtr) HTCAPTION;
        }
    }
}

protected internal static readonly ... and I wish the list could continue ...

Troposphere wrote:

Is it more appropriate to put this code into the Form class of the dialog box itself, or to have a separate class whose job it is to control the dialog box, and interface with it?