c# - ListBox that updates another part of View -

i want listbox, when submitted, send selected values controller, , response controller used update small piece of view.

the following code able update part of view, , selected values, separately. cannot values listbox while updating part of page:

code able return selected values controller:

public actionresult getinput(listboxmodel mod) {     othermodel data = new othermodel();     data.selected = mod;     return view("homepage", data); }  @model app.models.mainviewmodel @using(html.beginform("getinput", "home", formmethod.post)) {     <label for="optionlist">options:</label>     @html.listbox("optionlist", model.listboxmod.list)     <input type="submit" value="submit"/> } 

this code able update part of page, can't data listbox:

public actionresult getinputandupdate(listboxmodel mod) {     //get values out of mod , put them in newlist selectedvalues     //but no values appear in mod     //i can put fake data in selectedvalues , put on page     return partialview("partialviewupdate", selectedvalues); } 

main view:

@model app.models.mainviewmodel @using(html.beginform("getinputandupdate", "home", formmethod.post)) {     <label for="cgselected">care gaps:</label>     @html.listbox("cgselected", model.listboxmod.list)     <input id="submitbutton" data-url="@url.action("getinputandupdate")" type="submit" value="submit" />     <!-- <input id="loadfrommainframe" data-url="@url.action("caregapsubmitinit", model ??? )" type="submit" value="submit" /> doesn't work! -->  //the partial view html gets put here <div id="selectedvaluesitem"></div> } 

partial view:

@model app.models.newlist     @foreach(var str in model)     {         @str         <br />     } 

code update partial view:

$(function () {     $("#submitbutton").click(function (e)     {         e.preventdefault();         var url = $(this).data("url");         $("#selectedvaluesitem").load(url);     }); }); 

if want call getinputandupdate

$(function () {     $("#submitbutton").click(function (e)     {         e.preventdefault();         var url = "@url.action("getinputandupdate")?selectedvalue=" + $("#optionlist").val();         $("#selectedvaluesitem").load(url);     }); 

this

public actionresult getinputandupdate(listboxmodel mod) 

becomes this

public actionresult getinputandupdate(string selectedvalue)