Check if form is open?

[Arcdigital]

I have a button that when clicked opens another form. I want it to check and see if the form is already open, and if it is maximize it/bring it to the front. Is this possible?

[lisan_al_ghaib]

Hi ! Are you hiding or closing the form? here is a method if your are closing the form: public ParentForm : Form { ChildForm frm ; // I assume that your form is a member of the parent form public ParentForm() { // Components } public DisplayAChildForm() { if (frm == null) { frm = new ChildForm(); frm.OnFormClosed += new EventHandler (frmClosed_evnt); fmr.Show(); // you can use ShowDialog method also } } private frmClosed_evnt(object sender, EventArgs e) { frm.OnFormClosed -= new EventHandler (frmClosed_event); frm = null; } } that's it :)

[Natza Mitzi]

Hi, In this way you either create or show the form without using events. On click the ShowChild method is called. Test for null or disposed and show it if this is the case. If the form is ok we test if it is minimized then we restore it and then bring it to the front. Note that Show brings the form to the front only on the first call. Note - DO NOT CALL ShowDialog - it does not work if the form has been shown before Your application will crash with an InvalidOperationException public partial class Form1 : Form { private Form childForm; public Form1() { InitializeComponent(); } private void ShowChild() { if (childForm == null || childForm.IsDisposed) { childForm = new Form2(); childForm.Show(); } else { if (childForm.WindowState == FormWindowState.Minimized) { childForm.WindowState = FormWindowState.Normal; } childForm.BringToFront(); } } private void buttonShow_Click(object sender, EventArgs e) { ShowChild(); } } Natza Mitzi