Preferred method for referencing stylesheets from UserControl?

Question

First of all, we use the ASP.NET environment. Now I am creating an application that uses “Modules”, which is just a UserControl, with its “Javascript” on the right side of the control and the link to the stylesheet for this control. I want to keep it modular and would like the style of this control to be independent of markup / javascript.

So, I am wondering what is the preferred way to do this? Obviously, if I don't need the "theme" functionality that I will, I can just use the style tags at the top of the control. Right now I have a link element, as I said, and this is wrong, I don’t think.

Does anyone have any preferred methods, and if so, what and why?

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I briefly covered ASP.NET topics, but the idea of ​​these controls is a little different, I think.

This is mainly a shopping cart system. I do not want to delve into all this, but we use a very neat security system, and we do not want to use a shopping cart. I am developing a set of controls that can be deleted on a page, for example, in SiteFinity (which we use in the CMS system) or for any other project that we may have. I usually collected them in a DLL, so we get ACTUAL controls that we can drag from the toolbar, then I could use the internal “general” style and allow any additive style that someone might want, as well as provide some more attractive styles, good.

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Answer 1

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string filePath = page.ClientScript.GetWebResourceUrl(type, css);

// if filePath is not empty, embedded CSS exists -- register it
if (!String.IsNullOrEmpty(filePath))
{
    if (!Helpers.HeadContainsLinkHref(page, filePath))
    {
        HtmlLink link = new HtmlLink();
        link.Href = page.ResolveUrl(filePath);
        link.Attributes["type"] = "text/css";
        link.Attributes["rel"] = "stylesheet";
        page.Header.Controls.Add(link);
    }
}

Answer 2

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Answer 3

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Answer 4

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30DayPricingCalc.css

.30daypricingcalc_main_content
{
  ...
}

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