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POHow to update stylesheet on each page request?
 

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  1. POHow to update stylesheet on each page request?
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    <p>In my ASP.NET WebForms project I need to update stylesheet on each page request.</p> <p>No problem for now - I added css.ashx handler</p> <pre><code>public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/css"; Random r = new Random(); int red = r.Next(0, 255); int green = r.Next(0, 255); int blue = r.Next(0, 255); string css = string.Format("body {{ background-color: rgba({0}, {1}, {2}, 1); }}", red, green, blue); context.Response.Write(css); } </code></pre> <p>and put it to Master page:</p> <pre><code>&lt;link href="/Scripts/css.ashx?tmp=&lt;%=(new Random()).Next() %&gt;" rel="stylesheet" type="text/css" /&gt; </code></pre> <p>Still no problems. Css will be loaded per each request.</p> <p>Problems appear with UpdatePanels:</p> <pre><code>&lt;asp:UpdatePanel runat="server"&gt; &lt;ContentTemplate&gt; &lt;asp:Button Text="Update" runat="server" OnClick="btnOk_Click" ID="btnOk" /&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>Pressing on "Update" button, css will not be updated. It's correct behavior, but I need to find work around.</p> <p>My suggestion is to move <code>&lt;link href="/Scripts/css.ashx" rel="stylesheet" type="text/css" /&gt;</code> block to another <code>UpdatePanel</code> with <code>UpdateMode="Always"</code> in MasterPage:</p> <pre><code>&lt;asp:UpdatePanel runat="server" UpdateMode="Always"&gt; &lt;ContentTemplate&gt; &lt;link href="/Scripts/css.ashx?tmp=&lt;%=(new Random()).Next() %&gt;" rel="stylesheet" type="text/css" /&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>It works perfectly, but I can add this block in form element only. In result I have invalid HTML document (link element located in body, not head).</p> <p>How can I prevent it? Any ideas? I don't want to register javascript per each request to update link href.</p>
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    1. COOn each request are you sure? There must be some condition on which you might be changing the style-sheet?
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      1. POHow to update stylesheet on each page request?
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    2. CO@Shekhar Ok. It will be based on cookies variable for example.
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