How to get second related value from List in ViewData MVC?

Question

I have customer list which is having all details like customerId,firstname,lastname

GetAllCustomer() method code
      var customer = from d in dbContext.Customers
                                           select d;
                return customer.ToList();

In Index.cs I have bind firstname to dropdown list

var customerData =GetAllCustomer();

ViewBag.customerfirstname = new SelectList(customerData.Select(t=>t.firstname));

index.cshtml

@using (Html.BeginForm("Index", "Home", FormMethod.Get))
{
        <p>
            customer name : @Html.DropDownList("customerfirstname", "All")
            <input type="submit" value="Filter" /> 

        </p>
}

when I select any firstname from dropdown and click on submit I also want its customerId too.

How can I do it so?

Answer 1

You need to specify value field and text field for DropDownList, Now it will post CustomerID in for post against selected First Name :

var customerData =GetAllCustomer();

ViewBag.customerfirstname = new SelectList(customerData
                                           .Select(
                                                   t=>new 
                                                     { 
                                                      FirstName = t.firstname,
                                                     CustomerID = customerId),
                                          "CustomerID",
                                          "FirstName");

and then in your View:

@Html.DropDownList("customerfirstname", "All")