Remove Items from ASP.Net DropDownList based on condition using C#

Refer below sample.

HTML

<asp:DropDownList ID="ddlMonths" runat="server">
    <asp:ListItem>Select</asp:ListItem>
    <asp:ListItem>January</asp:ListItem>
    <asp:ListItem>February</asp:ListItem>
    <asp:ListItem>March</asp:ListItem>
    <asp:ListItem>April</asp:ListItem>
    <asp:ListItem>May</asp:ListItem>
    <asp:ListItem>June</asp:ListItem>
    <asp:ListItem>July</asp:ListItem>
    <asp:ListItem>August</asp:ListItem>
    <asp:ListItem>September</asp:ListItem>
    <asp:ListItem>October</asp:ListItem>
    <asp:ListItem>November</asp:ListItem>
    <asp:ListItem>December</asp:ListItem>
</asp:DropDownList>

Code

protected void Page_Load(object sender, EventArgs e)
{
    int currentMonth = DateTime.Today.Month;
    for (int i = ddlMonths.Items.Count; i >= 0; i--)
    {
        if (i > currentMonth)
        {
            ddlMonths.Items.RemoveAt(i - 1);
        }
    }
}