label problem......

HI...
the codes below is working fine...if i dun put this line (Label4.Visible = False) of code..but, if i place it in the codes as it is below then i have error
((((An unhandled exception of type 'System.NullReferenceException' occurred in OpenNETCFApplication4.exe)))
i want the label4 to be invisible......
this codes is only part of the program....

why is it so....???
can someone tell me y...thanxs in advance....

Code:

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Public Function createLabels(ByVal slot() As String, ByVal booktime() As String)
        groupbox2 = New OpenNETCF.Windows.Forms.GroupBox
      Com = New System.Windows.Forms.ComboBox
        Dim Label4 As New Label

        Dim x As Integer = 15
        Dim y As Integer = 30
        Dim a As Integer = 85
        Dim b As Integer = 30
        Dim i As Integer

        Dim counters As Integer
        For counters = 0 To slot.Length - 1 Step 1
            Dim newLinkLabel(counters) As OpenNETCF.Windows.Forms.LinkLabel
            Dim newLabel(counters) As Windows.Forms.Label
            newLinkLabel(counters) = New OpenNETCF.Windows.Forms.LinkLabel
            newLabel(counters) = New Windows.Forms.Label
            With newLabel(counters)
                .Location = New Point(x, y)
                .Visible = True
                .Text = slot(counters)
                .ForeColor = System.Drawing.Color.White
            End With

       
          Com.Items.Add(newLabel(counters).Text)

            y = y + 17
            b = b + 17

        Next counters

        Com.Location = New Point(112, 152)
        Label4.Visible = True
        Label4.Location = New Point(16, 152)
        Label4.Text = "Select Slot:"
        Label4.ForeColor = System.Drawing.Color.White
        Controls.Add(Label4)
        Controls.Add(Com)
       
    End Function

   
    Private Sub Com_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Com.SelectedIndexChanged
     
        If Com.SelectedIndex = Nothing Then
            MsgBox("Please select time")
        Else
            ComboBox1.Visible = False
            ComboBox2.Visible = False
            Label1.Visible = False
            Label2.Visible = False
            Label3.Visible = False
            Label4.Visible = False           
            Com.Visible = False
            DateTimePicker1.Visible = False
            groupbox2.Visible = True
            groupbox2 = New OpenNETCF.Windows.Forms.GroupBox
            groupbox2.Location = New Point(15, 40)
            groupbox2.Size = New Size(208, 180)
            groupbox2.Text = "Confirm Booking"
            groupbox2.BackColor = System.Drawing.Color.Purple
            groupbox2.ForeColor = System.Drawing.Color.White
            Me.Controls.Add(groupbox2)
            ptextbox = New System.Windows.Forms.TextBox
            ptextbox.Location = New Point(16, 24)
            ptextbox.Size = New Size(176, 112)
            groupbox2.Controls.Add(ptextbox)
            pbutton = New System.Windows.Forms.Button
            pbutton.Location = New Point(16, 136)
            pbutton.Size = New Size(176, 32)
            pbutton.Text = "Submit Booking"
            AddHandler pbutton.Click, AddressOf pbutton_click
            groupbox2.Controls.Add(pbutton)
            MenuItem2.Enabled = True
            PictureBox2.Visible = True
        End If
    End Sub

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Isn't Label4 out of scope in that example? It seems to be declared in the function createLabels.

Bill

Yes, declare Label4 in your class' scope, so that all methods can access it.

yap..thanxs....solved the problem..... :)

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