System.Windows.Forms.Form.WmClose C# (CSharp) Method

		private void WmClose (ref Message m)
		{
			if (this.Enabled == false)
				return; // prevent closing a disabled form.

			Form act = Form.ActiveForm;
			// Don't close this form if there's another modal form visible.
			if (act != null && act != this && act.Modal == true) {
				// Check if any of the parents up the tree is the modal form, 
				// in which case we can still close this form.
				Control current = this;
				while (current != null && current.Parent != act) {
					current = current.Parent;
				}
				if (current == null || current.Parent != act) {
					return;
				}
			}

			bool mdi_cancel = false;
			
			// Give any MDI children the opportunity to cancel the close
			if (mdi_container != null)
				foreach (Form mdi_child in mdi_container.MdiChildren)
					mdi_cancel = mdi_child.FireClosingEvents (CloseReason.MdiFormClosing, mdi_cancel);

			bool validate_cancel = false;
			if (!suppress_closing_events)
				validate_cancel = !ValidateChildren ();

			if (suppress_closing_events || 
			    !RaiseCloseEvents (false, validate_cancel || mdi_cancel)) {
				if (is_modal) {
					Hide ();
				} else {
					Dispose ();					
					if (act != null && act != this)
						act.SelectActiveControl ();
				}
				mdi_parent = null;
			} else {
				if (is_modal) {
					DialogResult = DialogResult.None;
				}
				closing = false;	
			}
		}