thank you any way but i got the answer and it is
<br />
Private Sub TabControl1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles TabControl1.SelectedIndexChanged<br />
<br />
'Grab the Web Browser control on this tab and read its URL property<br />
'NOTE, only expect to get one browser control.<br />
<br />
For Each wb As WebBrowser In TabControl1.SelectedTab.Controls.OfType(Of WebBrowser)(<br />
urlTextBox.Text = wb.Url.ToString<br />
Next<br />
End Sub<br />
The above does assume that you would only have one WebBrowser control on each TabPage. There are other ways of finding the WebBrowser control if this is not the case.