Populate ASP.NET DropDownlist Item Value Based on Other DropDownlist Without using Database

<asp:Label ID="lblcountry" runat="server" Text="Choose Country"></asp:Label>
<br />
<asp:DropDownList ID="ddlcountry" runat="server" AutoPostBack="True" onselectedindexchanged="ddlcountry_SelectedIndexChanged">
    <asp:ListItem>Select</asp:ListItem>
    <asp:ListItem>India</asp:ListItem>
    <asp:ListItem>China</asp:ListItem>
</asp:DropDownList>
<br>
<asp:Label ID="lblstate" runat="server" Text="State"></asp:Label>
<br />
<asp:DropDownList ID="ddlstate" runat="server">
</asp:DropDownList>

protected void ddlcountry_SelectedIndexChanged(object sender, EventArgs e)
{
    if (ddlcountry.SelectedValue == "India")
    {
        ddlstate.Items.Clear();
        ddlstate.Items.Add("Select");
        ddlstate.Items.Add("Delhi");
        ddlstate.Items.Add("TamilNadu");
        ddlstate.Items.Add("Karnataka");
        ddlstate.Items.Add("Kerala");
    }
    if (ddlcountry.SelectedValue == "China")
    {
        ddlstate.Items.Clear();
        ddlstate.Items.Add("Select");
        ddlstate.Items.Add("Beijing");
        ddlstate.Items.Add("Hebei");
        ddlstate.Items.Add("Shanghai");
        ddlstate.Items.Add("Fujian");
    }
}