check if cookie exists in vb.net

if I try to read a cookie (or session variable) that does not exist anymore I get a server error.
below an example of the code

if Request.Cookies("name of cookie") = "xyz" then
//some code
end if

a check like
- if Request.Cookies("name of cookie") = ""
- if Request.Cookies("name of cookie").length = 0
gives the same problem

is there a simple solution? in classic asp this was not an issue
reinoutkoolAsked:
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reinoutkoolAuthor Commented:
this was the trick:
If Not Request.Cookies("UserSettings") Is Nothing Then
If Not Request.Cookies("UserSettings")("IsAdmin") Is Nothing Then
...
end if
end if
0
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