Hi Jim,

You can use the MdiChildren property of the Parent Container Form. Here is some sample code:

MyChildForm childForm
foreach (Form frm in this.MdiChildren)
{
    if (frm is MyChildForm)
    {
        // found it
        childForm = (MyChildForm)frm;
        childForm.Close();
        break;
    }
}

>All,
>
> I have a MDI application with a menu. One of the options on the menu is Window. A sub option of the Window menu is close which will close the Active child form. If there is not a child form I get a nullreference exception error. What is the best way to test for a child window?