message id from GetResultData - vb.net

Question

I cannot seem to get or store the id of the post message I create. I am using this code to post a message:
Try
Dim fb = New FacebookClient(_accessToken)
AddHandler fb.PostCompleted, Function(o, e)
If (e.Cancelled) Then
ElseIf e.Error IsNot Nothing Then
MessageBox.Show(e.Error.Message)
Else
Dim result As Object = e.GetResultData()
_lastMessageId = result.Id
End If
Return MessageBox.Show("Message Posted successfully")
End Function
Dim parameters As Object = New ExpandoObject()
parameters.message = TextBox1.Text
fb.PostTaskAsync("me/feed", parameters)
MsgBox("This is the last message id " & _lastMessageId)
Catch ex As FacebookApiException
MessageBox.Show(ex.Message)
End Try
I just want to store the posted id so I can delete it later.
Here is the working code that i came up with thanks to prabir
Dim fb = New FacebookClient(_accessToken)
Dim parameters As Object = New ExpandoObject()
parameters.message = "Testing"
Dim task = fb.PostTaskAsync("me/feed", parameters)
task.ContinueWith(Function(t)
If t.Exception Is Nothing Then
Dim result As Object = t.Result
_lastMessageId = result.id
Else
MsgBox("error occurred")
End If
Return t.Result
End Function)

Answer 1

here is c# code which might help you get started with it.
Since you are using XTaskAsync methods use ContinueWith instead of PostCompleted.
fb.PostTaskAsync("me/feed", parameters)
.ContinueWith(t= > {
if(!t.IsFaulted) {
dynamic result = t.Result;
}
});
XTaskAsync methods returns Task<object>