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POMVC Dropdown list persting for each requests
 

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    <p>I am working on a web app using MVC, where all pages have header section consiting of three dropdowns one text box and an image button. So no matter on which page user is, he/she has ability to select a combination out of three dropdowns, enter some text in text box and hit image button to search in database.</p> <p>So i am using a strongly typed(BaseViewModel) master _Layoutthought, and then add two partial views on it, one to display user info and another one to display all dropdowns, text box and imaage button. Now, Models i have 3 models for each dropdown option/item and then a BaseViewModel which will have 3 properties as a list of each model and 3 int properties to hold selected item ID. And plan is to use this baseViewModel as parent class for all viewmodels so that i can fullfil my strongly tyed _Layout for each request and responce. OK i am not sure that if i have explained my requirement clearly :(.</p> <p>so here is the code all models:</p> <pre><code> namespace XYZNameSpace.Models { public class ManageCompany { public long ManageCompanyID { get; set; } public string ManageCompanyName { get; set; } } } namespace XYZNameSpace.Models { public class SuperCompany { public long SuperCompanyID { get; set; } public string SuperCompanyName { get; set; } } } public class User { public long UserID { get; set; } public string UserName { get; set; } public string UserLoginName { get; set; } public string UserLevel { get; set; } public int UserLevelId { get; set; } } namespace XYZNameSpace.Models { public class SearchResult { public string CompanyName { get; set; } public string SubCompanyName { get; set; } public string UserName { get; set; } } } </code></pre> <p>ViewModel</p> <pre><code> namespace XYZNameSpace.ViewModels { public class BaseViewModel : User { public long SelectedManageCompanyID { get; set; } public List&lt;SelectListItem&gt; ManageCompanyList { get; set; } public string SelectedManageCompanyName { get; set; } public long SelectedSuperCompanyID { get; set; } public List&lt;SelectListItem&gt; SuperCompanyList { get; set; } public string SelectedSuperCompnayName { get; set; } public int SelectedSearchOptionID { get; set; } public List&lt;SelectListItem&gt; SearchOptionsList { get; set; } public string SelectedSearchOptionName { get; set; } public string SearchWord { get; set; } } public class SearchOption { public int SearchOptionID { get; set; } public string SearchOptionName { get; set; } } } namespace XYZNameSpace.ViewModels { public class SearchResultsViewModel : BaseViewModel { public List&lt;SearchResult&gt; ResultsList { get; set; } } } </code></pre> <p>Controller</p> <pre><code>public class HomeController : Controller { // // GET: /Home/ public ActionResult Home() { BaseViewModel bVM = new BaseViewModel() { ManageCompanyList = (new List&lt;ManageCompany&gt;() { new ManageCompany() { ManageCompanyID = 1, ManageCompanyName = "MC 1" }, new ManageCompany() { ManageCompanyID = 2, ManageCompanyName = "MC 2" }, new ManageCompany() { ManageCompanyID = 3, ManageCompanyName = "MC 3" }, new ManageCompany() { ManageCompanyID = 4, ManageCompanyName = "MC 4" }, new ManageCompany() { ManageCompanyID = 5, ManageCompanyName = "MC 5" } }).Select(x =&gt; new SelectListItem { Value = x.ManageCompanyID.ToString(), Text = x.ManageCompanyName }).ToList(), SuperCompanyList = (new List&lt;SuperCompany&gt;(){ new SuperCompany(){ SuperCompanyID=6, SuperCompanyName="SC 6" }, new SuperCompany(){ SuperCompanyID=7, SuperCompanyName="SC 7" }, new SuperCompany(){ SuperCompanyID=8, SuperCompanyName="SC 8" }, new SuperCompany(){ SuperCompanyID=9, SuperCompanyName="SC 9" }, new SuperCompany(){ SuperCompanyID=10, SuperCompanyName="SC 10" } }).Select(y =&gt; new SelectListItem { Value = y.SuperCompanyID.ToString(), Text = y.SuperCompanyName }).ToList(), SearchOptionsList = (new List&lt;SearchOption&gt;(){ new SearchOption(){ SearchOptionID=11, SearchOptionName="SO 11" }, new SearchOption(){ SearchOptionID=12, SearchOptionName="SO 12" }, new SearchOption(){ SearchOptionID=13, SearchOptionName="SO 13" }, new SearchOption(){ SearchOptionID=14, SearchOptionName="SO 14" }, new SearchOption(){ SearchOptionID=15, SearchOptionName="SO 15" } }).Select(y =&gt; new SelectListItem { Value = y.SearchOptionID.ToString(), Text = y.SearchOptionName }).ToList() }; return View(bVM); } [HttpPost] public ActionResult Search(BaseViewModel bVM) { SearchResultsViewModel sRVM = new SearchResultsViewModel(); sRVM.ResultsList = new List&lt;SearchResult&gt;(){ new SearchResult() { CompanyName = bVM.SelectedSuperCompanyID.ToString(), SubCompanyName = bVM.SelectedManageCompanyID.ToString(), UserName = "Duh" } }; return View("SearchResults", sRVM); } } </code></pre> <p>Views /Home/Home.cshtml</p> <pre><code>@{ ViewBag.Title = "Home"; Layout = "~/Views/Shared/_Layout.cshtml"; } &lt;div style="float: left; vertical-align: top;"&gt; &lt;/div&gt; &lt;br /&gt; </code></pre> <p>/Home/SearchResults.cshtml</p> <pre><code>@model XYZNameSpace.ViewModels.SearchResultsViewModel &lt;table width="100%"&gt; &lt;thead&gt; &lt;tr&gt; &lt;td&gt; COMPANY &lt;/td&gt; &lt;td&gt; SUB COMPANY &lt;/td&gt; &lt;td&gt; USER NAME &lt;/td&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody&gt; @foreach (XYZNameSpace.Models.SearchResult sr in Model.ResultsList) { &lt;tr&gt; &lt;td&gt; @sr.CompanyName &lt;/td&gt; &lt;td&gt; @sr.SubCompanyName &lt;/td&gt; &lt;td&gt; @sr.UserName &lt;/td&gt; &lt;/tr&gt; } &lt;/tbody&gt; &lt;/table&gt; </code></pre> <p>/Shared/SearchDDLPartialView.cshtml</p> <pre><code> @model XYZNameSpace.ViewModels.BaseViewModel &lt;div&gt; &lt;div style="float: left"&gt; &lt;span class="Label"&gt;Search: &lt;/span&gt; @using (Html.BeginForm("Search", "Home", FormMethod.Post)) { @Html.DropDownListFor(x =&gt; x.SelectedSuperCompanyID, Model.SuperCompanyList) @Html.DropDownListFor(x =&gt; x.SelectedManageCompanyID, Model.ManageCompanyList) @Html.DropDownListFor(x =&gt; x.SelectedSearchOptionID, Model.SearchOptionsList) &lt;input type="image" src="../../Content/images/search.gif" /&gt; } &lt;/div&gt; &lt;/div&gt; </code></pre> <p>/Shared/_Layout.cshtml</p> <pre><code>@model XYZNameSpace.ViewModels.BaseViewModel &lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;@ViewBag.Title&lt;/title&gt; &lt;link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" /&gt; &lt;link href="@Url.Content("~/Content/BEClientProfile.css")" rel="Stylesheet" type="text/css" /&gt; &lt;script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;img src="../../Content/images/logo124.gif" alt="Logo" /&gt; &lt;/td&gt; &lt;td valign="top"&gt; &lt;div style="float: left; vertical-align: top; text-align: left"&gt; &lt;img src="../../Content/images/user-info.gif" alt="User Infor" /&gt; &lt;span class="Label"&gt;Welcome &lt;/span&gt;&lt;span class="HeaderLabelText"&gt;@Model.UserLevel&lt;/span&gt; &lt;/div&gt; &lt;div&gt; &lt;div style="float: left; width: 100%;"&gt; &lt;u&gt;&lt;span class="Label"&gt;Currently Editing:&lt;/span&gt; &lt;/u&gt; &lt;/div&gt; &lt;div style="float: left; width: 100%;"&gt; &lt;span class="Label"&gt;Company:&lt;/span&gt; &lt;span class="HeaderLabelText"&gt;@Model.SelectedManageCompanyID&lt;/span&gt; &lt;/div&gt; &lt;div style="float: left; width: 100%;"&gt; &lt;span class="Label"&gt;User:&lt;/span&gt; &lt;span class="HeaderLabelText"&gt;@Model.UserLoginName&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;td&gt; &lt;/td&gt; &lt;td&gt; @{Html.RenderPartial("SearchDDLPartialViews", Model);} &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="4"&gt; @RenderBody() &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>/Shared/UserPartialView.cshtml</p> <pre><code>@model XYZNameSpace.Models.User &lt;div style="float: left; margin-left: .5em;"&gt; &lt;img src="../../Content/images/user-info.gif" alt="User Infor" /&gt; &lt;span style="font-weight: bold; float: left;"&gt;Welcome &lt;/span&gt; &lt;/div&gt; </code></pre> <p>OK, i was able to select one item from each dropdown but when i click on image button at search Action in home control, the BaseViewModel has nothing other than selectedIDs, so when action is trying to display SearchResults view back, them _Layout.cshtml throughs error saying there nothing in lists that are used by dropdowns.</p> <p>so how do we persist this information for every request...?</p>
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