how to set default value HTML.TextBoxFor() - asp.net-mvc

Question

I have a view consisting of a form and textboxes.
How can I set a default value in each box for strings and int values?
I want the page to load up each box's value so I don't need to type values.
I'm not able to change anything in the Model.
#model MyDb.Production.ProductionMaterial
#{
ViewBag.Title = "CreateMaterial";
}
#using (Html.BeginForm()) {
#Html.ValidationSummary(true)
<fieldset>
<legend>ProductionOrderMaterial</legend>
<div class="editor-label">
#Html.LabelFor(model => model.Position)
</div>
<div class="editor-field"> //something like
#Html.TextBoxFor(model => model.Position, Or 5 )
#Html.ValidationMessageFor(model => model.Position)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.ArticleId)
</div>
<div class="editor-field"> //something like
#Html.TextBoxFor(model => model.ArticleId. Or "")
#Html.ValidationMessageFor(model => model.ArticleId)
</div>
}

Answer 1

Create an instance of the model in your action, assign some values to the properties of the model and pass that into the View method.
In your action have:
ProductionMaterial model = new ProductionMaterial();
model.Position = 5;
return this.View(model);
This will pass the model to the view and TextBoxFor( model => model.Position ) will display 5.

Answer 2

I see you already got answer, but I'll show you how you can do it another way:
In Controller
public ActionResult Index()
{
//here you must set VALUE what u want,
//for example I set current date
Viewbag.ExactlyWhatYouNeed = DateTime.Now
return View();
}
In View
#Html.TextBoxFor(model => model.CurrentDate, new { #Value = ViewBag.ExactlyWhatYouNeed})
And when you will load your View, you will get field with default value (current date in our example)
Its work on MVC 4
Hope Its will be usefull info for another people.