c# - is it possible to bind hiddenfield to dropdownlist? -

<asp:dropdownlist id="ddlpackage" runat="server" cssclass="ddlpackage"  height="24px" width="250px"> </asp:dropdownlist>  <cc1:listsearchextender id="ddlpackage_listsearchextender" runat="server"  enabled="true" targetcontrolid="ddlpackage"> </cc1:listsearchextender>  <asp:label id="lblpackage" runat="server" cssclass="errormsg"  style="color: red; display: none;"></asp:label>  <asp:hiddenfield id="hdnnewoldtype" runat="server"  value='<%#bind("newoldtype") %>' /> 

is possible bind hiddenfield dropdownlist?

if have 3 columns in datatable :

• code
• name
• type

and if want check type based on selected code can use selectedindexchanged event of drop down list mention below :

code dropdown list :

<asp:dropdownlist id="ddlpackage" runat="server" cssclass="ddlpackage"     height="24px" width="250px" onselectedindexchanged="ddlpackage_onselectedindexchanged"> </asp:dropdownlist> 

code behind :

protected void ddlpackage_onselectedindexchanged(object sender, eventargs e) {     var selectedcode = this.ddlpackage.selectedvalue;      // code check type selectedcode }