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