File.Exists on different domain

Hello,
How to check if a file exists on different domain?


If File.Exists("http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2") Then
    Return String.Format("<img src={0} alt='' />", "http://i1.asp.net/common/header/logo.png?cdn_id=01112010_2"
Else
    Return String.Empty 'always ends here
End If


Merry Christmas,
-imperialx

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