[YouTube-API] [.net] Unsubscribe Problem.

Hello,
sry for my bad english.

Im working on a programm based on vb.NET.
Uploading, get information and all this stuff works... but unsubscribe
not.
i always get a nullreferenceexception error. Same is in C#

This is my VB Source for unsubscribe

Dim s As Subscription = New Subscription
s.Type = SubscriptionEntry.SubscriptionType.channel
s.UserName = "THE-USER-I-WANNA-UNSUBSCRIBE"
request.delete(s)

Where is the problem?

I use the search and found this code (a little bit other)

Dim subscriptions As Feed(Of Subscription) =
request.GetSubscriptionsFeed("MY-AUTH-USERNAME")
Dim subscription As Subscription
Dim i As Integer

For Each subscription In subscriptions.Entries
i = i + 1
TextBox4.AppendText(i & ": " & subscription.UserName)
subscription.SubscriptionEntry.Delete()
Next

But here it unsubscribe all subscribtion. How could i delete/
unsubscribe a fixed user.

mfg.

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