Drop down list select new asp net mvc

Here's an example of how to create a dropdown list with a "Select New" option in ASP.NET MVC:

Model

public class MyModel
{
    public int Id { get; set; }
    public string Name { get; set; }
}

Controller

public class MyController : Controller
{
    public ActionResult Index()
    {
        List<MyModel> items = new List<MyModel>();
        items.Add(new MyModel { Id = 1, Name = "Item 1" });
        items.Add(new MyModel { Id = 2, Name = "Item 2" });
        items.Add(new MyModel { Id = 3, Name = "Item 3" });

        return View(items);
    }
}

View (Index.cshtml)

@model List<MyModel>

@using (Html.BeginForm())
{
    @Html.DropDownListFor(model => model, new SelectList(Model, "Id", "Name"), "Select New")
    <input type="submit" value="Save" />
}

In the above code, we're using the DropDownListFor helper method to create a dropdown list. We're passing in the Model property as the first argument, which is a list of MyModel objects. The second argument is a SelectList object that we're creating using the SelectList constructor. We're passing in the Model list as the first argument, and specifying the Id and Name properties as the value and text fields, respectively. The third argument is the default value for the dropdown list, which is "Select New".

Result

When you run the application and navigate to the Index action, you'll see a dropdown list with the following options:

Select New
Item 1
Item 2
Item 3

If you select "Select New" and submit the form, the Id property of the MyModel object will be set to 0, indicating that a new item was selected.

Note that you can customize the appearance and behavior of the dropdown list by using various options available in the DropDownListFor helper method, such as htmlAttributes, optionLabel, and selectedValue.

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Drop down list select new asp net mvc