hi expert
how can i test that one specific form (such as frmCh1) was added to the parent MDI Form ?
i wanna don't allow to add more than one instance a child form to MDI form at same the time

what action i do?
thanks and regards

I believe you could use something like this before opening new child form
Check out the MdiChildren property (or something like that, I can't recall it right now).

Programmer/Application developer
Belgrade, Serbia

with this code all of my MDI child Forms will be close
i don't want outher form become close
i want if a specific child form can not be add to the mdi Form when an instance of it also added to MDI parent FOrm

The following should work for you

In the Event that opens a new instance of your child form (usually a menu command or command button), use the following code

if (MdiChildren.Length < 1)
          {
              childForm frm = new childForm();
          }
          else
          {
              MessageBox.Show("There are too many Windows open " +
                  ", please close one",
                  "Warning", MessageBoxButtons.OK,
                  MessageBoxIcon.Warning);
          }

thanks
but i want to don't alow the same forms to be load in MDIParent but i wanna to allow the diferrents mdi Chid be able to add to the mdiParent

Well, I had the same problem as u had before.. My way of solving it was to, every time the user asked to create a new MDI child, you give the child a name.. ie:

newMdiChild.Name = "name";

the trick is, before u create the new mdi child, you check if there's any other mdi childs with that same name
ie:

foreach (mdiChild mdi in this.mdichildren)
{
if (mdi.Name == "name")
{
mdi.Close();
}
}


something like that (dont have my code up atm.. so rewrite it with correct spelling and stuff ^^ )

hope it'll help

Enuff enuff!

C# btw.