Searching in mvc3 using MultiSelectList - asp.net

Question

I am new in Mvc3 my problem is when i simply create MultiSelectList from the data base its working fine but i want to search on the basis of MultiSelectList selected values i cant handle how to do this
http://www.asp.net/mvc/tutorials/javascript/working-with-the-dropdownlist-box-and-jquery/using-the-dropdownlist-helper-with-aspnet-mvc
using above link i am able to create MultiSelectList
kindly help me how to search records on the basis of selected values from MultiSelectList
my question is that should i create another View to fetch record from database but problem is what will be the database query to select records

Answer 1

If you look at the sample source code, you can see that they load the list of countries into a multiselectlist:
public ActionResult MultiCountryVM() {
return View(new CountryViewModel());
}
public ActionResult MultiSelectCountry() {
ViewBag.Countrieslist = GetCountries(null);
return View();
}
private MultiSelectList GetCountries(string[] selectedValues) {
List<Country> Countries = new List<Country>()
{
new Country() { ID = 1, Name= "United States" },
new Country() { ID = 2, Name= "Canada" },
new Country() { ID = 3, Name= "UK" },
new Country() { ID = 4, Name= "China" },
new Country() { ID = 5, Name= "Japan" }
};
return new MultiSelectList(Countries, "ID", "Name", selectedValues);
}
Then on the form post they store the selected values into the ViewBag:
[HttpPost]
public ActionResult MultiSelectCountry(FormCollection form) {
ViewBag.YouSelected = form["Countries"];
string selectedValues = form["Countries"];
ViewBag.Countrieslist = GetCountries(selectedValues.Split(','));
return View();
}
It looks like they are putting it into a ViewBag so they can pass it to the MultiCountryVM view, and not actually doing any query with the data. If you wanted to do a query, you would just create a LINQ query using an appropriate context, which you'd also have to write since they only have context for the music entities.