populating Dropdown using another dropdown asp.net

I have two combo boxes in asp.net page. One is state, another is City. When a State is selected, corresponding cities are populated in a city combo. I have fill all the states, city in a Js file as an array, calling it in a asp.net page.
The value of the City combo box is not persisting during the form postbacks which is my problem.

the following is loadcity function which loads all cities when a state is selected.

<!--

function Loadcity(stateidx)
 {
      var cmbcity = document.getElementById("cmbcity");
      stateidx--;
      if(stateidx >=1){
      for(i=0;i<city[stateidx].length;i++)
       {
            cmbcity.options[i] = new Option();
            cmbcity.options[i].text = city[stateidx][i][1];
            cmbcity.options[i].value = city[stateidx][i][0];
      }
      var num_cities = cmbcity.options.length;
      for(i=num_cities;i>city[stateidx].length;i--) {
            cmbcity.options[i-1] = null;}
      }
}

----------------------------

            <asp:DropDownList id="cmbcity" runat=server>
            <asp:listitem value="" text="Select City" />
              </asp:DropDownList>

--------------------------------

anyone could help me

Thanks
dkgopiAsked:
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ZonebitCommented:
Whenever you dynamically add items to a .net control using javascript, those values aren't seen server-side due to issues with the ViewState (I think).

A work around would be to add an HtmlInputHidden in your asp.net page, then copy the selected value from the city drop down box to the hidden field using javascript.
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