I’m getting an error “An unhandled exception of type
'System.NullReferenceException' occurred in 11_1_26.exe Additional
information: Object reference not set to an instance of an object.” It
points to st.num = CDbl(txtNumber.Text)
I cannot see what is wrong. Please help.


Dim statistic() As statistics
Dim lastnumber As Integer
Private Sub btnRecord_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles btnRecord.Click
Dim st As statistics
lastnumber += 1
st.num = CDbl(txtNumber.Text)
statistic(lastnumber) = st
txtNumber.Text = 0
txtNumber.Focus()
End Sub

Private Sub btnAverage_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles btnAverage.Click
txtAverage.Text = statistic(50).average
End Sub
End Class
Class statistics
Private m_count As Integer
Private m_num As Double
Public Property count() As Integer
Get
Return m_count
End Get
Set(ByVal Value As Integer)
m_count = Value
End Set
End Property
Public Property num() As Double
Get
Return m_num
End Get
Set(ByVal Value As Double)
m_num = Value
End Set
End Property
Sub addnumber()
Dim total As Double
total += m_num
End Sub
Function average() As Double
Dim av As Double
av = m_num / m_count
Return av
End Function
End Class




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