Using dropdownlist event for displaying data

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ASP.NET

Hi all,

I have two dropdownlists as below:

<asp:DropDownList ID="ddlMonth" runat="server"                                                onselectedindexchanged="ddlMonth_SelectedIndexChanged">       <asp:ListItem Text="Select" Value="0"></asp:ListItem>
<asp:ListItem Text="Jan" Value="1"></asp:ListItem>
<asp:ListItem Text="Feb" Value="2"></asp:ListItem>
<asp:ListItem Text="Mar" Value="3"></asp:ListItem>
<asp:ListItem Text="Apr" Value="4"></asp:ListItem>
<asp:ListItem Text="May" Value="5"></asp:ListItem>
<asp:ListItem Text="June" Value="6"></asp:ListItem>                               <asp:ListItem Text="July" Value="7"></asp:ListItem>
<asp:ListItem Text="Aug" Value="8"></asp:ListItem>
<asp:ListItem Text="Sep" Value="9"></asp:ListItem>
<asp:ListItem Text="Oct" Value="10"></asp:ListItem>
<asp:ListItem Text="Nov" Value="11"></asp:ListItem>
<asp:ListItem Text="Dec" Value="12"></asp:ListItem>
</asp:DropDownList>
                                             &nbsp;&nbsp;&nbsp;&nbsp;
<asp:DropDownList ID="ddlDay" runat="server" Style="z-index: 131;"
TabIndex="3" Width="140px">
</asp:DropDownList>

Here, I am able to bind the data in "ddlDay" with using pageload event.
But, I want the data to be displayed in "ddlDay" when I select a particular month in "ddlMonth".

Please any one tell me which event should I use to do this.

Regards,