How to edit CSS style of a div using C# in .NET

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Add the runat="server" attribute to it so you have:

<div id="formSpinner" runat="server">
    <img src="https://stackoverflow.com/questions/175381/images/spinner.gif">
    <p>Saving...</p>
</div>

That way you can access the class attribute by using:

formSpinner.Attributes["class"] = "classOfYourChoice";

It’s also worth mentioning that the asp:Panel control is virtually synonymous (at least as far as rendered markup is concerned) with div, so you could also do:

<asp:Panel id="formSpinner" runat="server">
    <img src="https://stackoverflow.com/questions/175381/images/spinner.gif">
    <p>Saving...</p>
</asp:Panel>

Which then enables you to write:

formSpinner.CssClass = "classOfYourChoice";

This gives you more defined access to the property and there are others that may, or may not, be of use to you.

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