if somthing exists

How would I check if something exists on a web page that is displayed in my app.

Constantijn Enders
I want to see if an image exists on a web page, the one this is in my app.
R. Muti

Private Function DocContains(ByVal Criteria As String) As Boolean

Dim wb As New WebBrowser

wb.Navigate("http://www.google.com")

Dim HTMLContent As String = wb.DocumentText

If HTMLContent.Contains(Criteria) Then

Return True

Else

Return False

End If

End Function
Rajeeshun
This is really not clear. Do you know the web page that the image might be on How would the image in your app be in the web page You need to provide further details.
ThEpRoPhEcY373
I gust want my app to navigate to google.com and look to see if logo.gif is on the page somewhere
if somthing exists