How to checked checkboxes according to textbox text ?

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VB

ASP.NET

I have 4 checkboxes and 1 textbox on a web-form. If I type 1,2 in the textbox, then checkbox1 and checkbox2 will be checked. The code for this is as below. But I want when I type 1,2 then checkbox1 and checkbox2 should be disabled and unchecked.

Can anybody update this code?

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim separator As Char = ","c
        Dim allIIDs As New List(Of Int32)
        If TextBox1.Text.Length <> 0 Then
            For Each strNum As String In TextBox1.Text.Split(separator)
                Dim num As Int32
                If Int32.TryParse(strNum, num) Then
                    allIIDs.Add(num)
                End If
            Next
        End If
        allIIDs.Sort()
        For Each control As Control In Panel1.Controls
            If TypeOf control Is CheckBox Then
                Dim chk As CheckBox = DirectCast(control, CheckBox)
                chk.Checked = allIIDs.BinarySearch(Int32.Parse(chk.Text)) > -1
            End If
        Next
    End Sub

[edit]Code block added to improve legibility - OriginalGriff[/edit]