如何向Ajax滑块控件添加不同的值?

下面是一个丑陋的实现,我希望有人能找到更好的东西:

<asp:UpdatePanel runat="server">
    <ContentTemplate>
        <ajax:SliderExtender ID="sliderTest" runat="server" 
            Enabled="True" 
            Decimals="0" Maximum="10" Minimum="0"
            EnableHandleAnimation="true" 
            RaiseChangeOnlyOnMouseUp="true" 
            TargetControlID="txtBoxTest" />

        <asp:TextBox ID="txtBoxTest" runat="server" 
            OnTextChanged="txtBoxTest_TextChanged" 
            AutoPostBack="true" />
        <asp:Literal ID="litDisplay" runat="server" />
    </ContentTemplate>
</asp:UpdatePanel>

以及背后的代码:

protected void txtBoxTest_TextChanged(object sender, EventArgs e)
{
    switch (int.Parse(((TextBox)sender).Text))
    {
        case 0:
        case 1:
        case 2:
        case 3:
        case 4: litDisplay.Text = "Less than 5"; break;
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
        case 10: litDisplay.Text = "Greater than 5"; break;
    }
}