[asp.net-mvc] How to set the value of a hidden field from a controller in mvc

I want to set the value of a hidden field from a controller.How can i do this?

In view part i have given like this..

 <div>
@Html.Hidden("hdnFlag", null, new { @id = "hdnFlag" }) 
</div>

Please find code for respected region.

Controller

ViewBag.hdnFlag= Session["hdnFlag"];

View

<input type="hidden" value="@ViewBag.hdnFlag" id="hdnFlag" />

JavaScript

var hdnFlagVal = $("#hdnFlag").val();

Please try using following way.

@Html.Hidden("hdnFlag",(object) Convert.ToInt32(ViewBag.page_Count))

Without a view model you could use a simple HTML hidden input.

<input type="hidden" name="FullName" id="FullName" value="@ViewBag.FullName" />

You can transfer value from controller using ViewData[""].

ViewData["hdnFlag"] = userId;
return View();

Now, In you view.

@{
    var localVar = ViewData["hdnFlag"]
}
<input type="hidden" asp-for="@localVar" />

Hope this will help...

You could set the corresponding value in the ViewData/ViewBag:

ViewData["hdnFlag"] = "some value";

But a much better approach is to of course use a view model:

model.hdnFlag = "some value";
return View(model);

and use a strongly typed helper in your view:

@Html.HiddenFor(x => x.hdnFlag, new { id = "hdnFlag" })

if you are not using model as per your question you can do like this

@Html.Hidden("hdnFlag" , new {id = "hdnFlag", value = "hdnFlag_value" })

else if you are using model (considering passing model has hdnFlag property), you can use this approch

@Html.HiddenFor(model => model.hdnFlag, new { value = Model.hdnFlag})

You need to write following code on controller suppose test is model, and Name, Address are field of this model.

public ActionResult MyMethod()
{
    Test test=new Test();
    var test.Name="John";
    return View(test);   
}

now use like like this on your view to give set value of hidden variable.

@model YourApplicationName.Model.Test

@Html.HiddenFor(m=>m.Name,new{id="hdnFlag"})

This will automatically set hidden value=john.

If you're going to reuse the value like an id or if you want to just keep it you can add a "new{id = 'desiredID/value'}) as its parameters so you can access the value thru jquery/javascript

@Html.HiddenFor(model => model.Car_id)