in vb.net
follow the following
Declare Private form level variable in child form
Private strData As String
and also create public property to set and get this variable.
Public Property AnyName() as string
Get
Return strData
End Get
Set(ByVal value As String)
strData=value
End Set
End Property
That's All
now you can test it from in your Command Button or any other child calling event parent as :
Dim dlg As New frmName : dlg.ShowDialog()
If dlg.AnyName <> "" Then MsgBox(dlg.AnyName)