Hi Bruno,

Here is some sample code:

Dim frm As Form
For Each frm In Me.MdiChildren
    If TypeOf frm Is Form1 Then
        MessageBox.Show("Child of type Form1 exists.")
        Exit For
    End If
Next frm

>I'm updating a vb6 routine for vb.net that show chield forms. The routine check first if the form is in use, if the form aren't in use then create a instance and show it.
>Anyone call tell me what to write this example in vb.net?
>
>Thanks,
>
>
>The code in vb6 :
>
>Sub ShowChield(frmWindow as Form)
> Dim intForm as Integer, bolExist as Booleam
>
> For intForm = 1 to Forms.Count -1
> If Forms(intForm).Name = frmWindow.Name Then
> If Forms(intForm).WindowState = 1 Then Forms(intForm).WindowState = 0
> Forms(intForm).SetFocus
> bolExist = True
> Exit For
> Else
> bolExiste = False
> End If
> Next
>
> If bolExiste = False Then frmWindow.Show
>
>End Sub