How to show items of a dropdown box to another dropdown ?

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C#

ASP.NET

I have 2 dropdown boxes dropdown1 and dropdown 2 .... i want to show dropdown 2 items values same as dropdown 1...

<div>
       <asp:DropDownList ID="DropDownList1" runat="server">
           <asp:ListItem>A</asp:ListItem>
           <asp:ListItem>B</asp:ListItem>
           <asp:ListItem>C</asp:ListItem>
           <asp:ListItem></asp:ListItem>
       </asp:DropDownList>
       <asp:DropDownList ID="DropDownList2" runat="server">
       </asp:DropDownList>
   </div>

protected void Page_Load(object sender, EventArgs e)
{
    // Code for show DropDownList2 values from DropDownList1

}