Larry,

I'm not clear on what you are saying. If the referenced instance of the child form is out of scope then you can't rereference it again since it has been disposed at that point.

>Hi,
>
>I have problem when i re-open the child and it doesn't open...
>
>Ho to solve this problem?
>
>TIA
>>Larry,
>>
>>No you won't have to do this. The garbage collection handles the disposing of the objects.
>>
>>>Hello,
>>>
>>>should i have to commit the
>>>MyBase.Dispose(disposing)
>>>inside the
>>>
>>>Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
>>>?
>>>
>>>
>>>TIA
>>>>Larry,
>>>>
>>>>Inside the "Private Sub New(parent As Form)" constuctor, add the following:
>>>>
>>>>

>>>>Me.MdiParent = parent
>>>>

>>>>
>>>>
>>>>>Hello,
>>>>>
>>>>>How to make mdi and child form for this code?
>>>>>
>>>>>TIA
>>>>>
>>>>>>Larry,
>>>>>>
>>>>>>I ran the code through a converter and here are the results:
>>>>>>
>>>>>>

>>>>>>Class frmClients
>>>>>>   Private Shared m_instance As frmClients
>>>>>>
>>>>>>   Shared Function Instance(parent As Form) As frmClients
>>>>>>      If m_instance Is Nothing Then
>>>>>>         m_instance = New frmClients(parent)
>>>>>>      End If
>>>>>>      Return m_instance
>>>>>>   End Function 'Instance
>>>>>>
>>>>>>   Private Sub New(parent As Form)
>>>>>>      ...
>>>>>>   End Sub 'New
>>>>>>End Class 'frmClients '
>>>>>>

>>>>>>
>>>>>>Then elsewhere in your code to call the form
>>>>>>

>>>>>>frmClient.Instance(this).Show
>>>>>>

>>>>>>
>>>>>>
>>>>>>>Hi,
>>>>>>>im using VB.NET im not familiar in CS
>>>>>>>
>>>>>>>TIA
>>>>>>>
>>>>>>>>Larry,
>>>>>>>>
>>>>>>>>One approach is to use the Singleton design pattern. Here is a link to an article that describes this:
>>>>>>>>
>>>>>>>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/singletondespatt.asp
>>>>>>>>
>>>>>>>>Here is an example about how to limit your form to only one instance:
>>>>>>>>
>>>>>>>>1. Make the constructor of your form private.
>>>>>>>>2. Add a private static variable to your form, that is the type of your form.
>>>>>>>>3. Add a public static read-only property to your form that is the type of your form.
>>>>>>>>4. In the get method of this property, if the static variable is null, create a new instance of the form. Then return the static variable.
>>>>>>>>
>>>>>>>>Instead of a property, you can use a function.
>>>>>>>>
>>>>>>>>

>>>>>>>>class frmClients
>>>>>>>>{
>>>>>>>>#Region " Singleton Pattern "
>>>>>>>>    static frmClients m_instance;
>>>>>>>>    static frmClients Instance(Form parent)
>>>>>>>>    {
>>>>>>>>        if (m_instance == null)
>>>>>>>>            m_instance = new frmClients(parent);
>>>>>>>>        return m_instance;
>>>>>>>>    }
>>>>>>>>    private frmClients(Form parent)
>>>>>>>>    {
>>>>>>>>        ...
>>>>>>>>    }
>>>>>>>>#End Region
>>>>>>>>}
>>>>>>>>

>>>>>>>>
>>>>>>>>Then elsewhere in your code to call the form
>>>>>>>>

>>>>>>>>frmClient.Instance(this).Show;
>>>>>>>>

>>>>>>>>
>>>>>>>>IMPORTANT: Handle either the Closed or Closing event of frmClients by setting m_instance to null in Closed.
>>>>>>>>
>>>>>>>>
>>>>>>>>>Hi,
>>>>>>>>>
>>>>>>>>>I have mdi form and inside of the mdi form i have menu name "Form1" when i click the menu "Form1" the child form1 will popup as a child..but when i again the menu "Form1" the child form1 will popup again..
>>>>>>>>>
>>>>>>>>>how to control the form1 child to activate only once and detect if they are still activated...
>>>>>>>>>
>>>>>>>>>TIA
>>>>>>>>>
>>>>>>>>>Larry Santos