In my html page i've a default warning at the top of the page says to fill all input areas.

```
<span style="color:gray" class="help-block">Please enter value for all input fields.</span>

```

It is a page for adding some stuffs to database. When i click "add" button, it redirects `ActionResult` in my `C#` code. And inside this, according to entered input values, my code either inserts the stuff to database or reloads adding page which means unsuccessful to insert. 

```
[HttpPost]
public ActionResult InsertStuff(Stuff stuff)
{
    if (stuffManager.InsertStuff(stuff))
        return RedirectToAction("ListStuffs", "StuffController");  //successfully inserted!!
    else
        return RedirectToAction("AddNewStuffForm", "StuffController"); //reload page, here is where i'd like to change warning in html
}

```

In else part, i'd like to load same `AddNewStuffForm` page but i want my warning to change color from gray to red as in:

```
<span style="color:red" class="help-block">Please enter value for all input fields.</span>

```

I do not know how to do that, as i deduced, i need to send something to `html` in `else` part of my `C#` code, but i do not know how to do that. I really did some research and some solutions offer to use some methods like `Page_Load`. However i am really beginner level at `html` and i have difficulties in offered solutions. Can anyone simply explain what to do? Thanks in advance.