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:
 
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